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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

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