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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Total other comprehensive income (loss), pre-tax $ (10,430)     $ (81,360)     $ 13,001 $ (275,800)
Total other comprehensive income (loss), tax expense (benefit) (2,567)     (20,706)     3,288 (70,191)
Other comprehensive (loss) income, net of tax (7,863) $ 863 $ 16,713 (60,654) $ (50,829) $ (94,126) 9,713 (205,609)
Securities available for sale:                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss), before reclassifications, pre-tax (17,175)     (85,283)     (17,744) (296,444)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) (4,292)     (21,704)     (4,462) (75,445)
Other comprehensive income (loss), before reclassifications, net of tax (12,883)     (63,579)     (13,282) (220,999)
Amortization of unrealized holding losses on securities transferred to held to maturity category, pre tax 3,959     1,619     10,113 1,300
Amortization of unrealized holding losses on securities transferred to held to maturity category, tax expense (benefit) 1,012     412     2,586 331
Amortization of unrealized holding losses on securities transferred to held to maturity category, net of tax 2,947     1,207     7,527 969
Reclassification from AOCI, pre-tax             22,438  
Reclassification from AOCI, tax expense (benefit)             5,622  
Reclassification from AOCI, net of tax             16,816  
Total other comprehensive income (loss), pre-tax (13,216)     (83,664)     14,807 (295,144)
Total other comprehensive income (loss), tax expense (benefit) (3,280)     (21,292)     3,746 (75,114)
Other comprehensive (loss) income, net of tax (9,936)     (62,372)     11,061 (220,030)
Derivative instruments:                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss), before reclassifications, pre-tax 2,670     2,262     (2,153) 19,219
Other comprehensive income (loss) before reclassifications, tax expense (benefit) 683     575     (547) 4,891
Other comprehensive income (loss), before reclassifications, net of tax 1,987     1,687     (1,606) 14,328
Total other comprehensive income (loss), pre-tax 2,670     2,262     (2,153) 19,219
Total other comprehensive income (loss), tax expense (benefit) 683     575     (547) 4,891
Other comprehensive (loss) income, net of tax 1,987     1,687     (1,606) 14,328
Amortization of net actuarial loss recognized in net periodic pension cost                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Reclassification from AOCI, pre-tax 116     42     347 125
Reclassification from AOCI, tax expense (benefit) 30     11     89 32
Reclassification from AOCI, net of tax 86     31     258 93
Total defined benefit pension and post-retirement benefit plans                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Total other comprehensive income (loss), pre-tax 116     42     347 125
Total other comprehensive income (loss), tax expense (benefit) 30     11     89 32
Other comprehensive (loss) income, net of tax $ 86     $ 31     $ 258 $ 93