Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Fair Value	$ 507,279	$ 574,279
Cash and cash equivalents	102,580	53,336
Investment in subsidiaries	1,702	1,702
Federal income tax recoverable	25,642	8,995
Other assets	28,013	33,262
Total assets	1,485,533	1,495,274
Liabilities:
Senior unsecured notes due 2029 (less unamortized debt issuance cost of $844 in 2020 and $942 in 2019)	49,156	49,058
Subordinated debt securities (less unamortized debt issuance cost of $795 in 2020 and $846 in 2019)	55,907	55,856
Accounts payable and other accrued expenses	50,415	55,487
Total liabilities	1,314,611	1,231,992
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2020 and in 2019	3,757	3,757
Additional paid-in capital	122,893	123,468
Retained earnings	68,915	160,570
Accumulated other comprehensive income	383	688
Treasury stock (2,730,673 shares in 2020 and 2,749,738 in 2019), at cost	(25,026)	(25,201)
Total stockholders' equity	170,922	263,282	$ 255,532
Total liabilities and stockholders' equity	1,485,533	1,495,274
Parent Company [Member]
ASSETS
Fair Value	0	1,024
Cash and cash equivalents	30,066	19,637
Investment in subsidiaries	247,839	358,436
Deferred federal income taxes	285	1,053
Federal income tax recoverable	12,506	5,904
Other assets	19,844	21,278
Total assets	310,540	407,332
Liabilities:
Senior unsecured notes due 2029 (less unamortized debt issuance cost of $844 in 2020 and $942 in 2019)	49,156	49,058
Subordinated debt securities (less unamortized debt issuance cost of $795 in 2020 and $846 in 2019)	55,907	55,856
Accounts payable and other accrued expenses	34,555	39,136
Total liabilities	139,618	144,050
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2020 and in 2019	3,757	3,757
Additional paid-in capital	122,893	123,468
Retained earnings	68,915	160,570
Accumulated other comprehensive income	383	688
Treasury stock (2,730,673 shares in 2020 and 2,749,738 in 2019), at cost	(25,026)	(25,201)
Total stockholders' equity	170,922	263,282
Total liabilities and stockholders' equity	$ 310,540	$ 407,332