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, 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	47,733										47,733
Other comprehensive income (loss)	26,358													26,358
Treasury stock allocated to restricted stock award grants	0							(733)								733
Stock based compensation	4,540							4,540
Purchase of treasury stock	(58,546)															(58,546)
Exercise of options	1							1
Restricted stock forfeitures	0							244								(244)
Employee Stock Ownership Plan shares committed to be released	1,922							798										1,124
Funding of deferred compensation obligations	(249)																			(330)		81
Balance at end of year at Jun. 30, 2021	1,033,046				1,220			614,381			720,817			(43,267)		(221,072)		(38,169)		(2,205)		1,341
Balance at beginning of period at Dec. 31, 2020	1,011,287				1,220			609,531			673,084			(69,625)		(163,015)		(39,293)		(1,875)		1,260
Balance at end of year 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]
Accounting Standards Update [Extensible List]	ASU 2016-13
Balance at beginning of period at Mar. 31, 2021	$ 999,649				1,220			611,549			694,129			(72,507)		(195,361)		(38,734)		(2,141)		1,494
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,688										26,688
Other comprehensive income (loss)	29,240													29,240
Stock based compensation	2,397							2,397
Purchase of treasury stock	(25,709)															(25,709)
Exercise of options	1							1
Restricted stock forfeitures	0							2								(2)
Employee Stock Ownership Plan shares committed to be released	997							432										565
Funding of deferred compensation obligations	(217)																			(64)		(153)
Balance at end of year at Jun. 30, 2021	1,033,046				1,220			614,381			720,817			(43,267)		(221,072)		(38,169)		(2,205)		1,341
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 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 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