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, 2019		15,144,719
Beginning Balance at Dec. 31, 2019	$ 473,415	$ 139,103	$ 340,580	$ (6,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	13,493		13,493
Other comprehensive loss, net of tax	18,309			18,309
Stock-based compensation expense	421	$ 421
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		23,909
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(53)	$ (53)
Common stock repurchased (in shares)		(217,031)
Common stock repurchased	(7,973)	$ (7,973)
Cash dividends declared	(4,932)		(4,932)
Ending Balance (in shares) at Mar. 31, 2020		14,951,597
Ending Balance at Mar. 31, 2020	492,680	$ 131,498	349,141	12,041
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	19,740		19,740
Other comprehensive loss, net of tax	(12,175)			(12,175)
Stock-based compensation expense	703	$ 703
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		19,337
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(80)	$ (80)
Cash dividends declared	(5,382)		(5,382)
Ending Balance (in shares) at Mar. 31, 2021		14,928,434
Ending Balance at Mar. 31, 2021	$ 532,120	$ 131,695	$ 391,860	$ 8,565