Other Comprehensive Income (Loss) - Tax Effects of Components in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Before Tax
Other comprehensive (loss) income	$ (63,329)	$ (7,756)	$ (215,728)	$ 20,335
Tax Effect
Other comprehensive (loss) income	18,025	2,168	60,498	435
After Tax
Total other comprehensive (loss) income	(45,304)	(5,588)	(155,230)	20,770
Unrealized (Losses) on Debt Securities Available for Sale
Before Tax
Other comprehensive income (loss), before reclassifications	(65,744)	(13,609)	(198,171)	(26,804)
Other comprehensive (loss) income	(65,763)	(11,316)	(197,989)	(24,813)
Tax Effect
Other comprehensive income (loss), before reclassifications	18,589	3,666	55,528	4,615
Other comprehensive (loss) income	18,595	3,162	55,476	4,213
After Tax
Other comprehensive income (loss), before reclassifications	(47,155)	(9,943)	(142,643)	(22,189)
Total other comprehensive (loss) income	(47,168)	(8,154)	(142,513)	(20,600)
AOCI, Accumulated Gain (Loss), Debt Securities Available-for-sale, Accretion of Unrealized Gains (Losses), Parent
Before Tax
Reclassification from AOCI, current period	(19)	(3)	(28)	(24)
Tax Effect
Reclassification from AOCI, current period	6	1	7	24
After Tax
Reclassification from AOCI, current period	(13)	(2)	(21)	0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Other Reclassifications, Parent
Before Tax
Reclassification from AOCI, current period	0	2,296	210	2,015
Tax Effect
Reclassification from AOCI, current period	0	(505)	(59)	(426)
After Tax
Reclassification from AOCI, current period	0	1,791	151	1,589
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Before Tax
Other comprehensive income (loss), before reclassifications	1,639	2,035	7,171	9,182
Tax Effect
Other comprehensive income (loss), before reclassifications	(457)	(568)	(2,004)	(1,084)
After Tax
Other comprehensive income (loss), before reclassifications	1,182	1,467	5,167	8,098
Total other comprehensive (loss) income	1,182	1,467	5,167	8,098
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(14)	(14)	(42)	(42)
Tax Effect
Reclassification from AOCI, current period	3	4	11	11
After Tax
Reclassification from AOCI, current period	(11)	(10)	(31)	(31)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(339)	(1,511)	(1,017)	(4,533)
Tax Effect
Reclassification from AOCI, current period	95	422	285	1,266
After Tax
Reclassification from AOCI, current period	(244)	(1,089)	(732)	(3,267)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Before Tax
Other comprehensive income (loss), before reclassifications	1,148	3,050	(23,851)	40,541
Other comprehensive (loss) income	795	1,525	(24,910)	35,966
Tax Effect
Other comprehensive income (loss), before reclassifications	(211)	(852)	6,730	(3,971)
Other comprehensive (loss) income	(113)	(426)	7,026	(2,694)
After Tax
Other comprehensive income (loss), before reclassifications	937	2,198	(17,121)	36,570
Total other comprehensive (loss) income	$ 682	$ 1,099	$ (17,884)	$ 33,272