Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Fair Value	$ 574,279	$ 545,870
Cash and cash equivalents	53,336	35,594
Investment in subsidiaries	1,702	1,702
Deferred federal income taxes	2,185	4,983
Federal income tax recoverable	8,995
Other assets	33,262	12,571
Total assets	1,495,274	1,264,894
Liabilities:
Senior unsecured notes due 2029 (less unamortized debt issuance cost of $942 in 2019)	49,058
Revolving credit facility payable		30,000
Subordinated debt securities (less unamortized debt issuance cost of $846 in 2019 and $898 in 2018)	55,856	55,804
Accounts payable and other accrued expenses	55,487	28,202
Total liabilities	1,231,992	1,009,362
Stockholders’ equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2019 and in 2018	3,757	3,757
Additional paid-in capital	123,468	123,168
Retained earnings	160,570	161,195
Accumulated other comprehensive income (loss)	688	(6,660)
Treasury stock (2,749,738 shares in 2019 and 2,846,131 in 2018), at cost	(25,201)	(25,928)
Total stockholders’ equity	263,282	255,532	$ 251,118
Total liabilities and stockholders’ equity	1,495,274	1,264,894
Parent Company [Member]
ASSETS
Fair Value	1,024	786
Cash and cash equivalents	19,637	10,159
Investment in subsidiaries	358,436	344,904
Deferred federal income taxes	1,053	442
Federal income tax recoverable	5,904	6,133
Other assets	21,278	3,784
Total assets	407,332	366,208
Liabilities:
Senior unsecured notes due 2029 (less unamortized debt issuance cost of $942 in 2019)	49,058
Revolving credit facility payable		30,000
Subordinated debt securities (less unamortized debt issuance cost of $846 in 2019 and $898 in 2018)	55,856	55,804
Accounts payable and other accrued expenses	39,136	24,872
Total liabilities	144,050	110,676
Stockholders’ equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2019 and in 2018	3,757	3,757
Additional paid-in capital	123,468	123,168
Retained earnings	160,570	161,195
Accumulated other comprehensive income (loss)	688	(6,660)
Treasury stock (2,749,738 shares in 2019 and 2,846,131 in 2018), at cost	(25,201)	(25,928)
Total stockholders’ equity	263,282	255,532
Total liabilities and stockholders’ equity	$ 407,332	$ 366,208