Consolidated Statements of Changes in Stockholder's Equity (Unaudited) - USD ($) $ in Thousands	Total	Restricted Stock	Effect of adopting ASU No. 2016-13 ("CECL")	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Restricted Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Restricted Stock	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Effect of adopting ASU No. 2016-13 ("CECL")	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive (Loss)	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, 2021	$ 1,079,081		$ 6,212	$ 1,085,293	$ 1,246		$ 1,246	$ 667,906		$ 667,906	$ 765,133	$ 6,212	$ 771,345	$ (45,919)	$ (45,919)	$ (271,647)	$ (271,647)	$ (37,026)	$ (37,026)	$ (2,425)	$ (2,425)	$ 1,813	$ 1,813
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,404										20,404
Other comprehensive income (loss)	(54,436)													(54,436)
Issuance of common stock		$ 0				$ 1			$ (1)
Stock based compensation	1,915							1,915
Purchase of treasury stock	(21,685)															(21,685)
Exercise of stock options (62,859 shares)	(182)							(182)
Restricted stock forfeitures	0							676								(676)
Repurchase shares for taxes	(113)															(113)
Employee Stock Ownership Plan shares committed to be released	1,206							641										565
Funding of deferred compensation obligations	85																			(321)		406
Balance at end of year at Mar. 31, 2022	1,032,487				1,247			670,955			791,749			(100,355)		(294,121)		(36,461)		(2,746)		2,219
Balance at beginning of period at Dec. 31, 2022	1,053,595				1,309			781,165			857,518			(179,296)		(371,708)		(34,750)		(3,149)		2,506
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,723										18,723
Other comprehensive income (loss)	11,438													11,438
Stock based compensation	1,845							1,845
Purchase of treasury stock	(47,323)															(47,323)
Exercise of stock options (62,859 shares)	11							11
Restricted stock forfeitures	0							39								(39)
Repurchase shares for taxes	(133)															(133)
Excise tax on net stock repurchases	(475)															(475)
Employee Stock Ownership Plan shares committed to be released	1,142							582										560
Funding of deferred compensation obligations	67																			481		(414)
Balance at end of year at Mar. 31, 2023	$ 1,038,890				$ 1,309			$ 783,642			$ 876,241			$ (167,858)		$ (419,678)		$ (34,190)		$ (2,668)		$ 2,092