Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total	Cumulative Change, Adjusted Balance [Member] Common Stock [Member]	Cumulative Change, Adjusted Balance [Member] Retained Earnings [Member]	Cumulative Change, Adjusted Balance [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Change, Adjusted Balance [Member]	Cumulative Change, Adjustment [Member] Common Stock [Member]	Cumulative Change, Adjustment [Member] Retained Earnings [Member]	Cumulative Change, Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Change, Adjustment [Member]
Balance at beginning of period at Dec. 31, 2019	$ 352,344	$ 1,611	$ (3,786)	$ 350,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	4,810	0	4,810
Cash dividends declared	0	(4,477)	0	(4,477)
Repurchase of common stock	(13,784)	0	0	(13,784)
Issuance of common stock	11	0	0	11
Share based compensation	547	0	0	547
Share based compensation withholding obligation	(590)	0	0	(590)
Other comprehensive income (loss)	0	0	(1,068)	(1,068)
Balances at end of period at Mar. 31, 2020	338,528	1,944	(4,854)	335,618
Balance at beginning of period at Dec. 31, 2020	339,353	40,145	10,024	389,522	$ 339,353	$ 29,842	$ 10,024	$ 379,219
Balance at beginning of period (ASU 2016-13 [Member]) at Dec. 31, 2020									$ 0	$ (10,303)	$ 0	$ (10,303)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	22,037	0	22,037
Cash dividends declared	0	(4,592)	0	(4,592)
Repurchase of common stock	(3,601)	0	0	(3,601)
Issuance of common stock	19	0	0	19
Share based compensation	442	0	0	442
Share based compensation withholding obligation	(509)	0	0	(509)
Other comprehensive income (loss)	0	0	(5,686)	(5,686)
Balances at end of period at Mar. 31, 2021	$ 335,704	$ 47,287	$ 4,338	$ 387,329