Other Comprehensive Income (Loss) - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ (126,257)	$ (6,613)
Total other comprehensive income (loss), tax expense (benefit)	(32,131)	(1,684)
Other comprehensive loss, net of tax	(94,126)	(4,929)
Securities available for sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, pre-tax	(134,756)	(20,044)
Other comprehensive income (loss) before reclassifications, tax expense (benefit)	(34,294)	(5,101)
Other comprehensive income (loss), before reclassifications, net of tax	(100,462)	(14,943)
Reclassification from AOCI, pre-tax		(1,357)
Reclassification from AOCI, tax expense (benefit)		(345)
Reclassification from AOCI, net of tax		(1,012)
Total other comprehensive income (loss), pre-tax	(134,855)	(21,401)
Total other comprehensive income (loss), tax expense (benefit)	(34,319)	(5,446)
Other comprehensive loss, net of tax	(100,536)	(15,955)
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	99
Reclassification from AOCI, tax expense (benefit)	25
Reclassification from AOCI, net of tax	74
Derivative instruments:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, pre-tax	8,556	14,734
Other comprehensive income (loss) before reclassifications, tax expense (benefit)	2,177	3,750
Other comprehensive income (loss), before reclassifications, net of tax	6,379	10,984
Total other comprehensive income (loss), pre-tax	8,556	14,734
Total other comprehensive income (loss), tax expense (benefit)	2,177	3,750
Other comprehensive loss, net of tax	6,379	10,984
Amortization of net actuarial loss recognized in net periodic pension cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, pre-tax	42	54
Reclassification from AOCI, tax expense (benefit)	11	12
Reclassification from AOCI, net of tax	31	42
Total defined benefit pension and post-retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	42	54
Total other comprehensive income (loss), tax expense (benefit)	11	12
Other comprehensive loss, net of tax	$ 31	$ 42