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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 167,156 | $ 182,109 | $ 166,428 |
Available-for-sale debt securities, at fair value | 819,861 | 855,284 |  |
Income taxes recoverable | 30,576 | 34,283 |  |
Deferred income tax asset, net | 6,284 | 3,351 |  |
Other assets | 14,877 | 17,328 |  |
Total assets | 1,758,741 | 1,719,852 |  |
LIABILITIES: |  |  |  |
Total liabilities | 1,309,479 | 1,225,951 |  |
STOCKHOLDERS’ EQUITY: |  |  |  |
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 10 and 10 Outstanding shares - 10 and 10 Minimum liquidation preference - $9.99 and $9.99 per share | 0 | 0 |  |
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 46,817 and 46,707 Outstanding shares – 31,137 and 32,638 | 468 | 467 |  |
Treasury shares, at cost - 15,680 and 14,069 | (225,506) | (196,585) |  |
Additional paid-in capital | 103,445 | 96,036 |  |
Accumulated other comprehensive income (loss), net of taxes | 3,343 | 20,364 |  |
Retained earnings | 567,512 | 573,619 |  |
Total stockholders’ equity | 449,262 | 493,901 | $ 501,633 | $ 439,988
Total liabilities and stockholders’ equity | 1,758,741 | 1,719,852 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 62,934 | 86,508 |  |
Investments in subsidiaries and undistributed earnings | 357,375 | 378,906 |  |
Available-for-sale debt securities, at fair value | 0 | 808 |  |
Income taxes recoverable | 30,545 | 34,253 |  |
Deferred income tax asset, net | 6 | 0 |  |
Other assets | 72 | 149 |  |
Total assets | 450,932 | 500,624 |  |
LIABILITIES: |  |  |  |
Accounts payable | 30 | 20 |  |
Deferred income tax liability, net | 0 | 2,602 |  |
Dividends payable | 138 | 80 |  |
Other accrued expenses | 1,085 | 3,587 |  |
Total liabilities | 1,253 | 6,289 |  |
STOCKHOLDERS’ EQUITY: |  |  |  |
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 10 and 10 Outstanding shares - 10 and 10 Minimum liquidation preference - $9.99 and $9.99 per share | 0 | 0 |  |
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 46,817 and 46,707 Outstanding shares – 31,137 and 32,638 | 468 | 467 |  |
Treasury shares, at cost - 15,680 and 14,069 | (225,506) | (196,585) |  |
Additional paid-in capital | 103,445 | 96,036 |  |
Accumulated other comprehensive income (loss), net of taxes | 3,343 | 20,364 |  |
Retained earnings | 567,929 | 574,053 |  |
Total stockholders’ equity | 449,679 | 494,335 |  |
Total liabilities and stockholders’ equity | $ 450,932 | $ 500,624 |  |

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