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	43,363										43,363
Other comprehensive income (loss)	(109,926)													(109,926)
Issuance of common stock	102,741	$ 0			61	$ 1		102,680	$ (1)
Stock based compensation	4,107							4,107
Purchase of treasury stock	(53,176)															(53,176)
Exercise of stock options	(192)							(192)
Restricted stock forfeitures	0							787								(787)
Repurchase shares for taxes	(113)															(113)
Employee Stock Ownership Plan shares committed to be released	2,386							1,255										1,131
Funding of deferred compensation obligations	(199)																			(453)		254
Balance at end of year at Jun. 30, 2022	1,074,284				1,308			776,542			814,708			(155,845)		(325,723)		(35,895)		(2,878)		2,067
Balance at beginning of period at Mar. 31, 2022	1,032,487				1,247			670,955			791,749			(100,355)		(294,121)		(36,461)		(2,746)		2,219
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,959										22,959
Other comprehensive income (loss)	(55,490)													(55,490)
Issuance of common stock	102,741				61			102,680
Stock based compensation	2,192							2,192
Purchase of treasury stock	(31,491)															(31,491)
Exercise of stock options	(10)							(10)
Restricted stock forfeitures	0							111								(111)
Employee Stock Ownership Plan shares committed to be released	1,180							614										566
Funding of deferred compensation obligations	(284)																			(132)		(152)
Balance at end of year at Jun. 30, 2022	1,074,284				1,308			776,542			814,708			(155,845)		(325,723)		(35,895)		(2,878)		2,067
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	20,387										20,387
Other comprehensive income (loss)	13,125													13,125
Issuance of common stock		9				2			7
Stock based compensation	3,873							3,873
Purchase of treasury stock	(69,321)															(69,321)
Exercise of stock options	(22)							(22)
Restricted stock forfeitures	0							225								(225)
Excise tax on net stock repurchases	(697)															(697)
Repurchase shares for taxes	(133)															(133)
Employee Stock Ownership Plan shares committed to be released	2,127							1,000										1,127
Funding of deferred compensation obligations	(155)																			369		(524)
Balance at end of year at Jun. 30, 2023	1,022,788				1,311			786,248			877,905			(166,171)		(442,084)		(33,623)		(2,780)		1,982
Balance at beginning of period at Mar. 31, 2023	1,038,890				1,309			783,642			876,241			(167,858)		(419,678)		(34,190)		(2,668)		2,092
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,664										1,664
Other comprehensive income (loss)	1,687													1,687
Issuance of common stock		$ 9				$ 2			$ 7
Stock based compensation	2,028							2,028
Purchase of treasury stock	(21,998)															(21,998)
Exercise of stock options	(33)							(33)
Restricted stock forfeitures	0							186								(186)
Excise tax on net stock repurchases	(222)															(222)
Employee Stock Ownership Plan shares committed to be released	985							418										567
Funding of deferred compensation obligations	(222)																			(112)		(110)
Balance at end of year at Jun. 30, 2023	$ 1,022,788				$ 1,311			$ 786,248			$ 877,905			$ (166,171)		$ (442,084)		$ (33,623)		$ (2,780)		$ 1,982