Other Comprehensive Income (Loss) - Changes in Components of OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ 15,660	$ 73,229	$ (264,687)
Total other comprehensive income (loss), tax expense (benefit)	4,012	18,448	(66,093)
Other comprehensive income (loss), net of tax	11,648	54,781	(198,594)
Securities available for sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income gain (loss), before reclassifications, pre-tax	1,455	20,194	(285,829)
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit)	381	5,066	(71,478)
Other comprehensive income gain (loss), before reclassifications, net of tax	1,074	15,128	(214,351)
Reclassification from AOCI, pre-tax		41,494
Reclassification from AOCI, tax expense (benefit)		10,431
Reclassification from AOCI, net of tax		31,063
Amortization of unrealized holding losses on securities transferred to held to maturity category, pre tax	12,731	13,557
Amortization of unrealized holding losses on securities transferred to held to maturity category, tax expense (benefit)	3,255	3,466
Amortization of unrealized holding losses on securities transferred to held to maturity category, net of tax	9,476	10,091
Total other comprehensive income (loss), pre-tax	14,186	75,245	(280,865)
Total other comprehensive income (loss), tax expense (benefit)	3,636	18,963	(70,215)
Other comprehensive income (loss), net of tax	10,550	56,282	(210,650)
Amortization of unrealized holding losses on securities transferred to the held to maturity category
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax			4,964
Reclassification from AOCI, tax expense (benefit)			1,263
Reclassification from AOCI, net of tax			3,701
Derivative instruments:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income gain (loss), before reclassifications, pre-tax	508	(2,558)	20,118
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit)	130	(653)	5,125
Other comprehensive income gain (loss), before reclassifications, net of tax	378	(1,905)	14,993
Total other comprehensive income (loss), pre-tax	508	(2,558)	20,118
Total other comprehensive income (loss), tax expense (benefit)	130	(653)	5,125
Other comprehensive income (loss), net of tax	378	(1,905)	14,993
Net gain (loss) arising during the period
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income gain (loss), before reclassifications, pre-tax	543	80	(4,107)
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit)	138	20	(1,045)
Other comprehensive income gain (loss), before reclassifications, net of tax	405	60	(3,062)
Amortization of net actuarial loss recognized in net periodic pension cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax	423	462	167
Reclassification from AOCI, tax expense (benefit)	108	118	42
Reclassification from AOCI, net of tax	315	344	125
Total defined benefit pension and post-retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	966	542	(3,940)
Total other comprehensive income (loss), tax expense (benefit)	246	138	(1,003)
Other comprehensive income (loss), net of tax	$ 720	$ 404	$ (2,937)