Document and Entity Information [Abstract] Document and entity information. Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Common Stock [Member] Common Stock [Member] Common Class A Common Class A [Member] Common Class A [Member] Common Class B Common Class B [Member] Common Class B [Member] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Document Fiscal Year Focus Document Fiscal Period Focus Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Consolidated Balance Sheets [Abstract] Assets Assets [Abstract] Investments Investment [Abstract] Fixed maturities Fixed Maturities [Abstract] Fixed maturities. Held to maturity, at amortized cost (fair value $43,735,739 and $61,422,347) Total held to maturity, Amortized Cost Held to maturity, at amortized cost Held-to-maturity Securities Available for sale, at fair value (amortized cost $655,173,806 and $614,298,854) Total available for sale, Estimated Fair Value Available-for-sale Securities, Debt Securities Equity securities, available for sale, at fair value (cost $8,663,183 and $7,238,803) Available-for-sale Securities, Equity Securities Investments in affiliates Cost Method Investments Short-term investments, at cost, which approximates fair value Other Short-term Investments Total investments Investments Cash Cash Cash at beginning of year Cash at end of year Cash Accrued investment income Accrued Investment Income Receivable Premiums receivable Premiums Receivable, at Carrying Value Reinsurance receivable Reinsurance Recoverables Deferred policy acquisition costs Deferred Policy Acquisition Costs Deferred tax asset, net Deferred Tax Assets, Net of Valuation Allowance Prepaid reinsurance premiums Prepaid Reinsurance Premiums Property and equipment, net Property and equipment, Net Property and equipment Property, Plant and Equipment, Net Accounts receivable - securities Accounts Receivable, Net Federal income taxes recoverable Income Taxes Receivable Goodwill Goodwill Other intangible assets Intangible Assets, Net (Excluding Goodwill) Other Other Other Assets Total assets Total assets Assets Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Losses and loss expenses Balance at January 1 Balance at December 31 Liability for Claims and Claims Adjustment Expense Unearned premiums Unearned Premiums Accrued expenses Accrued Liabilities Reinsurance balances payable Reinsurance Payable Borrowings under line of credit Long-term Line of Credit Cash dividends declared to stockholders Dividends Payable Investment in subordinated debentures Subordinated debentures Subordinated Debt Due to affiliate Due to Affiliate Drafts payable Draft Payable Drafts payable. Other Other Liabilities Total liabilities Total liabilities Liabilities Stockholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $1.00 par value, authorized 2,000,000 shares; none issued Preferred Stock, Value, Issued Common stock value Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Treasury stock, at cost Treasury Stock, Value Total stockholders' equity Stockholders' equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Consolidated Statements of Income and Comprehensive Income [Abstract] Revenues Revenues [Abstract] Net premiums earned (includes affiliated reinsurance of $142,608,940, $130,555,613 and $134,823,098 - see note 3) Net premiums earned/Premiums earned Premiums Earned, Net Net investment income Investment income, net of investment expenses Net Investment Income Net realized investment gains Net realized investment gains Realized investment gains Net realized investment gains Realized Investment Gains (Losses) Installment payment fees Insurance Commissions and Fees Other Other Income Total revenues Total revenues Revenues Expenses Benefits, Losses and Expenses [Abstract] Net losses and loss expenses (includes affiliated reinsurance of $81,219,926, $87,950,502 and $81,539,930 - see note 3) Policyholder Benefits and Claims Incurred, Net Amortization of deferred policy acquisition costs Amortization charged to earnings Deferred Policy Acquisition Cost, Amortization Expense Other underwriting expenses Other Underwriting Expense Policyholder dividends Policyholder Dividends Interest Interest Expense Other Other Cost and Expense, Operating Net losses and loss expenses Total expenses Total expenses Benefits, Losses and Expenses Income (loss) before income taxes Income (loss) before income tax expense (benefit) Income before income tax expense (benefit) and equity in undistributed net income (loss) of subsidiaries Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Net income Net income Net income (loss) Net Income (Loss) Attributable to Parent Earnings per common share: Net earnings (loss) per common share: Earnings Per Share [Abstract] Common stock - basic and diluted Basic and diluted earnings per share Earnings Per Share Basic And Diluted Consolidated Statements of Comprehensive Income [Abstract] Other comprehensive income, net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gains (losses) on securities: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] Unrealized gain (loss) - subsidiaries Unrealized holding gain (loss) arising during the period, net of income tax (benefit) of $4,833,143, $12,237,669 and ($1,976,358) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification adjustment for gains included in net income, net of income tax of $2,332,209, $4,175,631 and $1,494,545 Other Comprehensive Income Reclassification Adjustments Included in Net Income Tax Reclassification adjustment, net of income tax. Comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Consolidated Statements of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Additional Paid-In Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income [Member] Retained Earnings Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Beginning balance, shares Ending balance, shares Balance Issuance of common stock (stock compensation plans) Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Issuance of common stock (stock compensation plans), shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Cash dividends Dividends, Common Stock Grant of stock options Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Purchase of treasury stock Payments for Repurchase of Common Stock Consolidated Statements of Cash Flows [Abstract] Cash Flows from Operating Activities: Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Equity in earnings (loss) of DFSC Equity in undistributed net income (loss) of subsidiaries Equity in (earnings) loss of DFSC Income (Loss) from Equity Method Investments Changes in Assets and Liabilities: Increase (Decrease) in Operating Capital [Abstract] Losses and loss expenses Increase Decrease in Losses and Loss Expenses Losses and loss expenses. Unearned premiums Increase (Decrease) in Unearned Premiums Premiums receivable Increase (Decrease) in Premiums Receivable Deferred policy acquisition costs Deferred policy acquisition costs Increase (Decrease) in Deferred Policy Acquisition Costs Deferred income taxes Increase (Decrease) in Deferred Income Taxes Reinsurance receivable Increase (Decrease) in Reinsurance Recoverable Prepaid reinsurance premiums Increase (Decrease) in Prepaid Reinsurance Premiums Accrued investment income Increase (Decrease) in Accrued Investment Income Receivable Amounts due to affiliate Increase (Decrease) in Due to Affiliates Reinsurance balances payable Increase (Decrease) in Reinsurance Payables Current income taxes Increase (Decrease) in Income Taxes Payable Accrued expenses Increase (Decrease) in Accrued Liabilities Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Investing Activities: Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Available for sale Payments to Acquire Available-for-sale Securities, Debt Purchase of equity securities: Payments to Acquire Available-for-sale Securities, Equity Maturity of fixed maturities: Maturity of Fixed Maturities [Abstract] Maturity of fixed maturities. Held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Available for sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Available for sale Proceeds from Sale of Available-for-sale Securities, Debt Sales of equity securities Proceeds from Sale of Available-for-sale Securities, Equity Purchase of MICO Payments to Acquire Businesses, Gross Additional equity investment in DFSC Net increase in investment in affiliates Payments to Acquire Interest in Subsidiaries and Affiliates Net sales of short-term investments Net sale (purchase) of short-term investments Proceeds from Sale of Short-term Investments Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Financing Activities: Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash dividends paid Payments of Dividends, Common Stock Issuance of common stock Proceeds from Issuance of Common Stock Payments on line of credit Repayments of Lines of Credit Borrowings under line of credit Proceeds from Lines of Credit Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Net change in cash Net increase (decrease) in cash Cash and Cash Equivalents, Period Increase (Decrease) Interest paid Interest Paid Earnings Per Share Earnings Per Share [Text Block] Deferred Policy Acquisition Costs / Reinsurance [Abstract] Reinsurance Reinsurance [Text Block] Investments [Abstract] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Segment Information [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Borrowings [Abstract] Borrowings Long-term Debt [Text Block] Fair Value Measurements [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Income Taxes [Abstract] Income Taxes Income Tax Disclosure [Text Block] Impact of New Accounting Standards [Abstract] Impact of New Accounting Standards Accounting Changes and Error Corrections [Text Block] Fair Values of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Summary of reconciliation of the numerators and denominators used in the basic and diluted per share computations Schedule of Earnings Per Share Reconciliation [Table Text Block] Reconciliation of diluted shares outstanding Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] Summary of amortized cost and estimated fair value of fixed maturities by contractual maturity Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities [Table Text Block] Schedule of amortized cost and fair value of fixed maturity securities. Summary of gross realized gains and losses from investments before applicable income taxes Realized Gain (Loss) on Investments [Table Text Block] Summary of fixed maturities and equity securities with unrealized losses Unrealized Gain (Loss) on Investments [Table Text Block] Summary of financial information Summary of Financial Information [Table Text Block] Summary of financial information. Summary of financial data by segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair value measurements for investments in available-for-sale fixed maturity and equity securities Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Percentage of ownership interest Outstanding stock percentage Equity Method Investment, Ownership Percentage Stock ownership percentage owned by third party Stock Ownership Percentage Owned by Third Party Stock ownership percentage owned by third party. Voting power percentage of outstanding common stock Percentage of Voting Power Owned by Major Shareholder Percentage of voting power owned by major shareholder. Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Basic and diluted net income per share: Reconciliation of Basic and Diluted Weighted Average Shares Outstanding [Abstract] Reconciliation of basic and diluted weighted average shares outstanding. Basic and diluted net income per share Weighted-average effect of dilutive securities Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract] Options excluded from diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Earnings Per Share (Textual) [Abstract] Earnings Per Share (Textual) [Abstract] Earnings per share. Common stock payable interest rate Excess Dividend Rate on Common Stock Excess dividend rate on common stock. Ceded Credit Risk [Table] Ceded Credit Risk [Line Items] Excess of loss reinsured under an agreement Contracts in Force Subject to Participation Through Reinsurance, Value Reinsurance (Textual) [Abstract] Reinsurance (Textual) [Abstract] Reinsurance. Percentage of accumulation of losses Percentage of quota-share agreement with third-party reinsurers Contracts in Force Subject to Participation Through Reinsurance, Percentage Summary of amortized cost and estimated fair value of fixed maturities Held to Maturity Securities [Abstract] Held to maturity securities. Held to Maturity Held-to-maturity Securities, Debt Maturities [Abstract] Held to Maturity, Gross Unrealized Gains Held-to-maturity Securities, Unrecognized Holding Gain Held to Maturity, Gross Unrealized Losses Held-to-maturity Securities, Unrecognized Holding Loss