Other Comprehensive Income (Loss) - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ (81,360)			$ (11,476)			$ (275,800)	$ (19,282)
Total other comprehensive income (loss), tax expense (benefit)	(20,706)			(2,920)			(70,191)	(4,908)
Other comprehensive loss, net of tax	(60,654)	$ (50,829)	$ (94,126)	(8,556)	$ (889)	$ (4,929)	(205,609)	(14,374)
Securities available for sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, pre-tax	(85,283)			(12,408)			(296,444)	(27,487)
Other comprehensive income (loss) before reclassifications, tax expense (benefit)	(21,704)			(3,158)			(75,445)	(6,996)
Other comprehensive income (loss), before reclassifications, net of tax	(63,579)			(9,250)			(220,999)	(20,491)
Reclassification from AOCI, pre-tax				(764)				(2,121)
Reclassification from AOCI, tax expense (benefit)				(194)				(539)
Reclassification from AOCI, net of tax				(570)				(1,582)
Total other comprehensive income (loss), pre-tax	(83,664)			(13,172)			(295,144)	(29,608)
Total other comprehensive income (loss), tax expense (benefit)	(21,292)			(3,352)			(75,114)	(7,535)
Other comprehensive loss, net of tax	(62,372)			(9,820)			(220,030)	(22,073)
Amortization of unrealized holding gains on securities transferred to the held to maturity category
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax	(1,619)						(1,300)
Reclassification from AOCI, tax expense (benefit)	(412)						(331)
Reclassification from AOCI, net of tax	(1,207)						(969)
Derivative instruments:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, pre-tax	2,262			1,629			19,219	10,129
Other comprehensive income (loss) before reclassifications, tax expense (benefit)	575			414			4,891	2,578
Other comprehensive income (loss), before reclassifications, net of tax	1,687			1,215			14,328	7,551
Total other comprehensive income (loss), pre-tax	2,262			1,629			19,219	10,129
Total other comprehensive income (loss), tax expense (benefit)	575			414			4,891	2,578
Other comprehensive loss, net of tax	1,687			1,215			14,328	7,551
Amortization of net actuarial loss recognized in net periodic pension cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax	42			67			125	197
Reclassification from AOCI, tax expense (benefit)	11			18			32	49
Reclassification from AOCI, net of tax	31			49			93	148
Total defined benefit pension and post-retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	42			67			125	197
Total other comprehensive income (loss), tax expense (benefit)	11			18			32	49
Other comprehensive loss, net of tax	$ 31			$ 49			$ 93	$ 148