Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Treasury stock	Retained earnings	Accumulated other comprehensive income
Balance, beginning of period (in shares) at Dec. 31, 2018		19,761,742
Balance, beginning of period at Dec. 31, 2018	$ 430,201	$ 2	$ 257,181	$ (36,706)	$ 207,866	$ 1,858
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock	3			3
Stock option exercise (in shares)		116,971
Stock option exercise	1,656		1,301	355
Repurchase of common stock thorough stock repurchase program	(36,706)			(36,706)
Share-based compensation, net of forfeitures	2,114		2,114
Net income	20,503				20,503
Other comprehensive income (loss)	12,493					12,493
Balance, end of period (in shares) at Dec. 31, 2019		19,878,713
Balance, ending of period at Dec. 31, 2019	430,201	$ 2	257,181	(36,706)	207,866	1,858
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock	122
Issuance of treasury stock	$ 2			2
Stock option exercise (in shares)	54,814
Stock option exercise	$ (33)		(153)	120
Repurchase of common stock thorough stock repurchase program	(1,564)			(1,564)
Share-based compensation, net of forfeitures	2,335		2,335
Net income	47,585				47,585
Other comprehensive income (loss)	7,261					7,261
Balance, end of period (in shares) at Dec. 31, 2020		19,878,713
Balance, ending of period at Dec. 31, 2020	485,787	$ 2	259,363	(38,148)	255,451	9,119
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury stock	0
Issuance of common stock on restricted stock grants (in shares)		24,629
Issuance of common stock on restricted stock grants	812		812
Share-based compensation, net of forfeitures	1,730		1,730
Net income	43,164				43,164
Other comprehensive income (loss)	(7,455)					(7,455)
Balance, end of period (in shares) at Dec. 31, 2021		19,903,342
Balance, ending of period at Dec. 31, 2021	$ 524,038	$ 2	$ 261,905	$ (38,148)	$ 298,615	$ 1,664