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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Securities:      
Unrealized holdings losses, pre-tax amount $ (2,125) $ 13,646 $ (172,699)
Unrealized holdings losses, tax (expense) benefit 457 (2,932) 37,131
Unrealized holdings losses, after-tax amount (1,668) 10,714 (135,568)
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, before tax (6,449) (6,781) (5,715)
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, tax 1,387 1,458 1,229
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, after tax (5,062) (5,323) (4,486)
Less: reclassification adjustment for realized losses, pre-tax amount 0 (10,310) (912)
Less: reclassification adjustment for realized losses, tax (expense) benefit 0 2,217 (196)
Less: reclassification adjustment for realized losses, after-tax amount 0 (8,093) (716)
Net unrealized losses, pre-tax amount 4,324 30,737 (166,072)
Net unrealized losses, tax (expense) benefit (930) (6,607) 35,706
Net unrealized losses, after-tax amount 3,394 24,130 (130,366)
Cash Flow Hedges:      
Net increase in fair value, pre-tax amount 5,790 179 10,038
Net increase in fair value, tax (expense) benefit (1,245) (38) (2,158)
Net increase in fair value, after-tax amount 4,545 141 7,880
Net increase in fair value, pre-tax amount 3,646 261 9,770
Net increase in fair value, tax (expense) benefit (784) (56) (2,100)
Net increase in fair value, after-tax amount 2,862 205 7,670
Postretirement Plans:      
Net actuarial loss, pre-tax amount 856 114 2,859
Net actuarial loss, tax (expense) benefit (184) (25) (614)
Net actuarial loss, after-tax amount 672 89 2,245
Less: Amortization of net actuarial losses, pre-tax amount 4 3 (947)
Less: Amortization of net actuarial losses, tax (expense) benefit (1) (1) 203
Less: Amortization of net prior service credits, after-tax amount 3 2 (744)
Less: Amortization of net prior service credits, pre-tax amount 24 24 24
Less: Amortization of net prior service credits, tax (expense) benefit (5) (5) (5)
Less: Amortization of net prior service credits, after-tax amount 19 19 19
Net loss on postretirement plans, pre-tax amount 828 87 3,782
Net loss on postretirement plans, tax (expense) benefit (178) (19) (812)
Net (loss) gain on postretirement plans, net of tax 650 68 2,970
Other comprehensive income, pre-tax amount 8,798 31,085 (152,520)
Other comprehensive income, tax (expense) benefit (1,892) (6,682) 32,794
Other comprehensive income (loss) 6,906 24,403 (119,726)
Interest Expense, Borrowings and Subordinated Debentures      
Cash Flow Hedges:      
Less: effective portion reclassified into interest expense, pre-tax amount 3,821 3,364 263
Less: effective portion reclassified into interest expense, tax (expense) benefit (822) (723) (57)
Less: effective portion reclassified into interest expense, after-tax amount 2,999 2,641 206
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Less: effective portion reclassified into interest expense, pre-tax amount 3,821 3,364 263
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax 822 723 57
Less: Amounts reclassified from AOCI 2,999 2,641 206
Interest Income, Interest and Fees on Loans      
Cash Flow Hedges:      
Less: effective portion reclassified into interest expense, pre-tax amount (1,677) (3,446) 5
Less: effective portion reclassified into interest expense, tax (expense) benefit 361 741 (1)
Less: effective portion reclassified into interest expense, after-tax amount (1,316) (2,705) 4
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Less: effective portion reclassified into interest expense, pre-tax amount (1,677) (3,446) 5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax (361) (741) 1
Less: Amounts reclassified from AOCI $ (1,316) $ (2,705) $ 4