Other Comprehensive Income (Loss) - Changes in Components of OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ (47,635)	$ 32,600	$ 25,029
Total other comprehensive income (loss), tax expense (benefit)	(12,124)	8,296	6,369
Other comprehensive (loss) income, net of tax	(35,511)	24,304	18,660
Securities available for sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income gain (loss), before reclassifications, pre-tax	(51,470)	27,788	24,983
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit)	(13,099)	7,071	6,358
Other comprehensive income gain (loss), before reclassifications, net of tax	(38,371)	20,717	18,625
Reclassification from AOCI, pre-tax	(2,170)	(46)	2,511
Reclassification from AOCI, tax expense (benefit)	(552)	(12)	639
Reclassification from AOCI, net of tax	(1,618)	(34)	1,872
Total other comprehensive income (loss), pre-tax	(53,713)	27,742	27,494
Total other comprehensive income (loss), tax expense (benefit)	(13,670)	7,059	6,997
Other comprehensive (loss) income, net of tax	(40,043)	20,683	20,497
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	(73)
Reclassification from AOCI, tax expense (benefit)	(19)
Reclassification from AOCI, net of tax	(54)
Derivative instruments:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income gain (loss), before reclassifications, pre-tax	10,848	923	(2,975)
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit)	2,761	235	(758)
Other comprehensive income gain (loss), before reclassifications, net of tax	8,087	688	(2,217)
Reclassification from AOCI, pre-tax	(4,676)	2,040
Reclassification from AOCI, tax expense (benefit)	(1,190)	519
Reclassification from AOCI, net of tax	(3,486)	1,521
Total other comprehensive income (loss), pre-tax	6,172	2,963	(2,975)
Total other comprehensive income (loss), tax expense (benefit)	1,571	754	(758)
Other comprehensive (loss) income, net of tax	4,601	2,209	(2,217)
Total defined benefit pension and post-retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	(94)	1,895	510
Total other comprehensive income (loss), tax expense (benefit)	(25)	483	130
Other comprehensive (loss) income, net of tax	(69)	1,412	380
Net gain (loss) arising during the period
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income gain (loss), before reclassifications, pre-tax	(356)	1,069	91
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit)	(92)	272	23
Other comprehensive income gain (loss), before reclassifications, net of tax	(264)	797	68
Amortization of net actuarial loss recognized in net periodic pension cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax	262	259
Reclassification from AOCI, tax expense (benefit)	67	66
Reclassification from AOCI, net of tax	$ 195	193
Reclassification adjustment for settlement loss related to the VERP realized in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax		567
Reclassification from AOCI, tax expense (benefit)		145
Reclassification from AOCI, net of tax		422
New prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax		(485)
Reclassification from AOCI, tax expense (benefit)		(123)
Reclassification from AOCI, net of tax		(362)
Amortization of net actuarial loss recognized in net periodic pension cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax		485	419
Reclassification from AOCI, tax expense (benefit)		123	107
Reclassification from AOCI, net of tax		$ 362	$ 312