Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	RETAINED EARNINGS Cumulative Effect, Period of Adoption, Adjustment	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	TREASURYSTOCK	UNALLOCATED ESOP SHARES	COMMON STOCK ACQUIRED BY DEFERRED COMP PLANS	DEFERRED COMPENSATION PLANS
Beginning Balance at Dec. 31, 2022	$ 1,597,703		$ 832	$ 981,138	$ 918,158	$ 433	$ (165,045)	$ (127,154)	$ (10,226)	$ (3,427)	$ 3,427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,536				40,536
Current - period other comprehensive (loss) income	16,899						16,899
Cash dividends paid	(18,594)				(18,594)
Distributions from deferred comp plans	47			47						138	(138)
Purchase of employee restricted shares to fund statutory tax withholding	(1,667)							(1,667)
Stock option exercises	790			(217)				1,007
Allocation of ESOP shares	1,056			244					812
Allocation of Stock Award Plan ("SAP") shares	2,833			2,833
Treasury shares issued due to acquisition	0
Allocation of stock options	44			44
Ending Balance at Mar. 31, 2023	1,640,080	$ 433	832	984,089	940,533	$ 433	(148,146)	(127,814)	(9,414)	(3,289)	3,289
Beginning Balance at Dec. 31, 2023	1,690,596		832	989,058	974,542		(141,115)	(127,825)	(4,896)	(2,694)	2,694
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32,082				32,082
Current - period other comprehensive (loss) income	(10,470)						(10,470)
Cash dividends paid	(18,144)				(18,144)
Distributions from deferred comp plans	33			33						148	(148)
Purchase of employee restricted shares to fund statutory tax withholding	(1,237)							(1,237)
Stock option exercises	0
Allocation of ESOP shares	753			(58)					811
Allocation of Stock Award Plan ("SAP") shares	1,521			1,521
Allocation of stock options	28			28
Ending Balance at Mar. 31, 2024	$ 1,695,162		$ 832	$ 990,582	$ 988,480		$ (151,585)	$ (129,062)	$ (4,085)	$ (2,546)	$ 2,546