Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Fair Value	$ 290,073	$ 507,279
Cash and cash equivalents	352,867	102,580
Investment in subsidiaries	1,702	1,702
Federal income tax recoverable	18,217	24,691
Other assets	25,753	28,013
Total assets	1,553,598	1,496,717
Liabilities:
Senior unsecured notes due 2029 (less unamortized debt issuance cost of $746 in 2021 and $844 in 2020)	49,254	49,156
Subordinated debt securities (less unamortized debt issuance cost of $743 in 2021 and $795 in 2020)	55,959	55,907
Accounts payable and other accrued expenses	50,394	50,415
Total liabilities	1,378,077	1,329,011
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2021 and in 2020	3,757	3,757
Additional paid-in capital	122,844	122,893
Retained earnings	74,703	65,699
Accumulated other comprehensive income	(1,035)	383
Treasury stock (2,700,364 shares in 2021 and 2,730,673 in 2020), at cost	(24,748)	(25,026)
Total stockholders' equity	175,521	167,706	$ 262,762
Total liabilities and stockholders' equity	1,553,598	1,496,717
Parent Company [Member]
ASSETS
Cash and cash equivalents	32,482	30,066
Investment in subsidiaries	239,832	247,839
Deferred federal income taxes	50	285
Federal income tax recoverable	9,028	12,506
Other assets	19,913	19,844
Total assets	301,305	310,540
Liabilities:
Senior unsecured notes due 2029 (less unamortized debt issuance cost of $746 in 2021 and $844 in 2020)	49,254	49,156
Subordinated debt securities (less unamortized debt issuance cost of $743 in 2021 and $795 in 2020)	55,959	55,907
Accounts payable and other accrued expenses	20,571	34,555
Total liabilities	125,784	139,618
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2021 and in 2020	3,757	3,757
Additional paid-in capital	122,844	122,893
Retained earnings	74,703	68,915
Accumulated other comprehensive income	(1,035)	383
Treasury stock (2,700,364 shares in 2021 and 2,730,673 in 2020), at cost	(24,748)	(25,026)
Total stockholders' equity	175,521	170,922
Total liabilities and stockholders' equity	$ 301,305	$ 310,540