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Accumulated Other Comprehensive Income (Loss) - Changes in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]        
Unrealized loss on securities, before tax amount $ (27,975) $ 5,565 $ (20,796) $ 72,146
Unrealized loss on securities, tax effect 6,353 (1,232) 4,723 (15,960)
Unrealized loss on securities, net of tax amount (21,622) 4,333 (16,073) 56,186
Reclassification adjustment for securities gain included in net income, before tax amount 0 (2) (33,511) (3,053)
Reclassification adjustment for securities gain included in net income, tax effect 0 1 7,610 676
Reclassification adjustment for securities gain included in net income, net of tax amount 0 (1) (25,901) (2,377)
Amortization of net unrealized losses on AFS securities transferred to HTM. before-tax amount 824 1,192 2,787 3,232
Amortization of net unrealized losses on AFS securities transferred to HTM, tax (187) (264) (633) (715)
Amortization of net unrealized losses on AFS securities transferred to HTM, net of tax amount 637 928 2,154 2,517
Net unrealized losses on interest rate swaps used in cash flow hedges, before-tax amount (1,153)   (678)  
Net unrealized losses on interest rate swaps used in cash flow hedges, tax (262)   (154)  
Net unrealized losses on interest rate swaps used in cash flow hedges, net of tax amount (891)   (524)  
Amortization of net unrecognized pension and postretirement items, before tax amount 371 329 1,111 984
Amortization of net unrecognized pension and postretirement items, tax effect (81) (73) (243) (219)
Amortization of net unrecognized pension and postretirement items, net of tax amount 290 255 868 765
Total Other Comprehensive Income, Before Tax Amount (27,933) 7,083 (51,087) 73,309
Total Other Comprehensive Income, Tax Effect 6,347 (1,568) 11,611 (16,218)
Other Comprehensive (Loss)/Income $ (21,586) $ 5,515 $ (39,476) $ 57,091