CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2020	$ 18,076	$ 141,112	$ 189,521	$ 21,339	$ 370,048
Balance (in shares) at Dec. 31, 2020	18,076,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	15,160	0	15,160
Cash dividends declared	0	0	(904)	0	(904)
Other comprehensive loss	0	0	0	(9,131)	(9,131)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 20	(126)	0	0	(106)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes (in shares)	20,049
Repurchases of common stock	$ (43)	(743)	0	0	(786)
Repurchases of common stock (in shares)	(43,184)
Stock based compensation	$ 0	390	0	0	390
Balance at Mar. 31, 2021	$ 18,053	140,633	203,777	12,208	374,671
Balance (in shares) at Mar. 31, 2021	18,053,229
Balance at Dec. 31, 2021	$ 17,760	133,215	242,750	13,702	$ 407,427
Balance (in shares) at Dec. 31, 2021	17,760,243				17,760,243
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	14,278	0	$ 14,278
Cash dividends declared	0	0	(1,950)	0	(1,950)
Other comprehensive loss	0	0	0	(30,003)	(30,003)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 19	(214)	0	0	(195)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes (in shares)	19,662
Repurchases of common stock	$ (106)	(2,911)	0	0	(3,017)
Repurchases of common stock (in shares)	(106,498)
Stock based compensation	$ 0	528	0	0	528
Balance at Mar. 31, 2022	$ 17,673	$ 130,618	$ 255,078	$ (16,301)	$ 387,068
Balance (in shares) at Mar. 31, 2022	17,673,407				17,673,407