Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in-Capital	Additional Paid-in-Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive (Loss)	Accumulated Other Comprehensive (Loss) Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock Held by the Employee Stock Ownership Plan	Common Stock Held by the Employee Stock Ownership Plan Cumulative Effect, Period of Adoption, Adjusted Balance	Stock Held by Rabbi Trust	Stock Held by Rabbi Trust Cumulative Effect, Period of Adoption, Adjusted Balance	Deferred Compensation Obligations	Deferred Compensation Obligations Cumulative Effect, Period of Adoption, Adjusted Balance
Balance at beginning of period at Dec. 31, 2018	$ 972,060	$ 0	$ 972,060	$ 1,159	$ 1,159	$ 527,037	$ 527,037	$ 560,216	$ 548	$ 560,764	$ (71,897)	$ (548)	$ (72,445)	$ 0	$ 0	$ (43,835)	$ (43,835)	$ (1,259)	$ (1,259)	$ 639	$ 639
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,717							54,717
Other comprehensive loss	3,710										3,710
Issuance of common stock	14			14
Treasury stock allocated to restricted stock award grants	0					(1,095)								1,095
Stock based compensation	3,694					3,694
Purchase of treasury stock shares	(55,309)													(55,309)
Restricted stock forfeitures	0					736								(736)
Employee Stock Ownership Plan shares committed to be released	3,566					1,295										2,271
Funding of deferred compensation obligations	65																	(261)		326
Balance at end of year at Dec. 31, 2019	982,517			1,173		531,667		615,481			(68,735)			(54,950)		(41,564)		(1,520)		965
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	57,603							57,603
Other comprehensive loss	(890)										(890)
Issuance of common stock	68,530			47		68,483
Treasury stock allocated to restricted stock award grants	0					(481)								481
Stock based compensation	8,790					8,790
Purchase of treasury stock shares	(108,166)													(108,166)
Restricted stock forfeitures	(24)					175								(199)
Repurchase shares for taxes	(174)					7								(181)
Employee Stock Ownership Plan shares committed to be released	3,161					890										2,271
Funding of deferred compensation obligations	(60)																	(355)		295
Balance at end of year at Dec. 31, 2020	1,011,287			1,220		609,531		673,084			(69,625)			(163,015)		(39,293)		(1,875)		1,260
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	92,049							92,049
Other comprehensive loss	23,706										23,706
Issuance of common stock	47,260			26		47,234
Treasury stock allocated to restricted stock award grants	0					(733)								733
Stock based compensation	8,880					8,880
Purchase of treasury stock shares	(107,774)													(107,774)
Exercise of stock options	(25)					(25)
Restricted stock forfeitures	0					1,234								(1,234)
Repurchase shares for taxes	(357)													(357)
Employee Stock Ownership Plan shares committed to be released	4,052					1,785										2,267
Funding of deferred compensation obligations	3																	(550)		553
Balance at end of year at Dec. 31, 2021	$ 1,079,081			$ 1,246		$ 667,906		$ 765,133			$ (45,919)			$ (271,647)		$ (37,026)		$ (2,425)		$ 1,813