CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2018	$ 15,718	$ 270,761	$ 192,203	$ (5,544)	$ 473,138
Net income			57,408		57,408
Other comprehensive income (loss), net of tax				4,446	4,446
Common cash dividends declared			(3,775)		(3,775)
Stock-based compensation expense		2,469			2,469
Issuance of shares of common stock as a result of the acquisition, net of issuance cost	9	390			399
Issuance of common stock under employee benefit plans	101	1,165			1,266
Balance at Dec. 31, 2019	15,828	274,785	245,836	(1,098)	535,351
Net income			60,582		60,582
Other comprehensive income (loss), net of tax				2,474	2,474
Repurchase and cancellation of shares of common stock as a result of share repurchase program	(101)	(1,843)	(1,835)		(3,779)
Common cash dividends declared			(3,779)		(3,779)
Stock-based compensation expense		2,150			2,150
Issuance of common stock under employee benefit plans	79	714			794
Balance at Dec. 31, 2020	15,806	275,807	300,804	1,376	593,793
Net income			98,905		98,905
Other comprehensive income (loss), net of tax				176	176
Repurchase and cancellation of shares of common stock as a result of share repurchase program	(293)	(4,961)	(8,914)		(14,168)
Common cash dividends declared			(3,781)		(3,781)
Stock-based compensation expense		2,352			2,352
Issuance of common stock under employee benefit plans	100	570			670
Balance (Accounting Standards Update 2016-13) at Dec. 31, 2021			(937)		(937)
Balance at Dec. 31, 2021	$ 15,613	$ 273,768	$ 386,077	$ 1,552	$ 677,010