Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Debt securities	$ 545,870	$ 605,746
Cash and cash equivalents	35,594	64,982
Investment in subsidiaries	1,702	1,702
Deferred federal income taxes	4,983	1,937
Federal income tax recoverable		7,532
Other assets	12,571	13,856
Total assets	1,264,894	1,231,126
LIABILITIES AND STOCKHOLDERS' EQUITY
Revolving credit facility payable	30,000	30,000
Subordinated debt securities	55,804	55,753
Accounts payable and other accrued expenses	28,202	28,933
Total liabilities	1,009,362	980,008
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2018 and 2017	3,757	3,757
Additional paid-in capital	123,168	123,180
Retained earnings	161,195	136,474
Accumulated other comprehensive income	(6,660)	12,234
Treasury stock (2,846,131 shares in 2018 and 2,703,803 in 2017), at cost	(25,928)	(24,527)
Total stockholders equity	255,532	251,118	$ 265,736
Total liabilities and stockholders' equity	1,264,894	1,231,126
Parent Company [Member]
ASSETS
Debt securities	786	150
Cash and cash equivalents	10,159	12,194	$ 9,034
Investment in subsidiaries	344,904	344,496
Deferred federal income taxes	442	493
Federal income tax recoverable	6,133	3,914
Other assets	3,784	3,571
Total assets	366,208	364,818
LIABILITIES AND STOCKHOLDERS' EQUITY
Revolving credit facility payable	30,000	30,000
Subordinated debt securities	55,804	55,753
Accounts payable and other accrued expenses	24,872	27,947
Total liabilities	110,676	113,700
Stockholders' equity:
Common stock, $.18 par value, authorized 33,333,333 shares; issued 20,872,831 shares in 2018 and 2017	3,757	3,757
Additional paid-in capital	123,168	123,180
Retained earnings	161,195	136,474
Accumulated other comprehensive income	(6,660)	12,234
Treasury stock (2,846,131 shares in 2018 and 2,703,803 in 2017), at cost	(25,928)	(24,527)
Total stockholders equity	255,532	251,118
Total liabilities and stockholders' equity	$ 366,208	$ 364,818