CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2020		14,909,097
Beginning Balance at Dec. 31, 2020	$ 529,314	$ 131,072	$ 377,502	$ 20,740
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	37,883		37,883
Other comprehensive loss, net of tax	(12,072)			(12,072)
Stock-based compensation expense	1,514	$ 1,514
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		41,970
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(308)	$ (308)
Cash dividends declared	(10,783)		(10,783)
Ending Balance (in shares) at Jun. 30, 2021		14,951,067
Ending Balance at Jun. 30, 2021	545,548	$ 132,278	404,602	8,668
Beginning Balance (in shares) at Mar. 31, 2021		14,928,434
Beginning Balance at Mar. 31, 2021	532,120	$ 131,695	391,860	8,565
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	18,143		18,143
Other comprehensive loss, net of tax	103			103
Stock-based compensation expense	811	$ 811
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		22,633
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(228)	$ (228)
Cash dividends declared	(5,401)		(5,401)
Ending Balance (in shares) at Jun. 30, 2021		14,951,067
Ending Balance at Jun. 30, 2021	545,548	$ 132,278	404,602	8,668
Beginning Balance (in shares) at Dec. 31, 2021		14,739,956
Beginning Balance at Dec. 31, 2021	541,294	$ 123,111	424,412	(6,229)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	31,821		31,821
Other comprehensive loss, net of tax	(108,737)			(108,737)
Stock-based compensation expense	1,517	$ 1,517
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		46,641
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(390)	$ (390)
Common stock repurchased (in shares)		(161,556)
Common stock repurchased	(7,413)	$ (7,413)
Cash dividends declared	(11,711)		(11,711)
Ending Balance (in shares) at Jun. 30, 2022		14,625,041
Ending Balance at Jun. 30, 2022	446,381	$ 116,825	444,522	(114,966)
Beginning Balance (in shares) at Mar. 31, 2022		14,746,410
Beginning Balance at Mar. 31, 2022	482,446	$ 123,012	435,347	(75,913)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	15,026		15,026
Other comprehensive loss, net of tax	(39,053)			(39,053)
Stock-based compensation expense	893	$ 893
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		27,101
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(276)	$ (276)
Common stock repurchased (in shares)		(148,470)
Common stock repurchased	(6,804)	$ (6,804)
Cash dividends declared	(5,851)		(5,851)
Ending Balance (in shares) at Jun. 30, 2022		14,625,041
Ending Balance at Jun. 30, 2022	$ 446,381	$ 116,825	$ 444,522	$ (114,966)