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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2025
Equity [Abstract] |
Schedule of AOCI | The following table summarizes the changes within each classification of AOCI, net of tax:
(dollars in thousands) | Unrealized Gains and Losses on Available-for-Sale Debt Securities |  | Unrecognized Gains and Losses on Held-to-Maturity Securities |  | Gains and Losses on Hedges |  | Defined Benefit Pension Plans |  | Total
Year Ended December 31, 2025 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (668,063) |  |  | $ | (82,294) |  |  | $ | 4,314 |  |  | $ | — |  |  | $ | (746,043) |
Other comprehensive income (loss) before reclassifications | 239,600 |  |  | — |  |  | 8,126 |  |  | — |  |  | 247,726 |
Amounts reclassified from AOCI to income (1) | 27 |  |  | 11,830 |  |  | 7,789 |  |  |  |  | 19,646 |
Balance at end of period | $ | (428,436) |  |  | $ | (70,464) |  |  | $ | 20,229 |  |  | $ | — |  |  | $ | (478,671) |
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (652,518) |  |  | $ | (95,472) |  |  | $ | 9,181 |  |  | $ | — |  |  | $ | (738,809) |
Other comprehensive income (loss) before reclassifications | (15,702) |  |  | — |  |  | (17,936) |  |  | — |  |  | (33,638) |
Amounts reclassified from AOCI to income (1) | 157 |  |  | 13,178 |  |  | 13,069 |  |  |  |  | 26,404 |
Balance at end of period | $ | (668,063) |  |  | $ | (82,294) |  |  | $ | 4,314 |  |  | $ | — |  |  | $ | (746,043) |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (642,346) |  |  | $ | (112,664) |  |  | $ | (31,549) |  |  | $ | 137 |  |  | $ | (786,422) |
Other comprehensive income (loss) before reclassifications | (14,817) |  |  | 1,325 |  |  | 51,871 |  |  | — |  |  | 38,379 |
Amounts reclassified from AOCI to income (1) | 4,645 |  |  | 15,867 |  |  | (11,141) |  |  | (137) |  |  | 9,234 |
Balance at end of period | $ | (652,518) |  |  | $ | (95,472) |  |  | $ | 9,181 |  |  | $ | — |  |  | $ | (738,809) |
(1)See table below for details about reclassifications to income.
Schedule of Reclassifications out of AOCI | The following table summarizes the significant amounts reclassified out of each component of AOCI:
| Years Ended December 31, |  |
(dollars in thousands) | 2025 |  | 2024 |  | 2023 |  |
Details about AOCI Components | Amount Reclassified from AOCI |  | Affected Line Item in the Statement of Income
Unrealized gains and losses on available-for-sale debt securities | $ | (37) |  |  | $ | (212) |  |  | $ | (6,265) |  |  | Debt securities gains (losses), net
| 10 |  |  | 55 |  |  | 1,620 |  |  | Income tax (expense) benefit
| $ | (27) |  |  | $ | (157) |  |  | $ | (4,645) |  |  | Net income
Amortization of unrecognized losses on held-to-maturity securities transferred from available-for-sale | $ | (15,855) |  |  | $ | (17,664) |  |  | $ | (21,239) |  |  | Interest income (expense)
| 4,025 |  |  | 4,486 |  |  | 5,372 |  |  | Income tax (expense) benefit
| $ | (11,830) |  |  | $ | (13,178) |  |  | $ | (15,867) |  |  | Net income
Gains and losses on hedges Interest rate contracts | $ | (10,505) |  |  | $ | (17,628) |  |  | $ | 15,067 |  |  | Interest income (expense)
| 2,716 |  |  | 4,559 |  |  | (3,926) |  |  | Income tax (expense) benefit
| $ | (7,789) |  |  | $ | (13,069) |  |  | $ | 11,141 |  |  | Net income
Amortization of defined benefit pension items |  |  |  |  |  |  |
Actuarial gains (losses) | $ | — |  |  | $ | — |  |  | $ | 182 |  |  | Salaries and employee benefits
| — |  |  | — |  |  | (45) |  |  | Income tax (expense) benefit
| $ | — |  |  | $ | — |  |  | $ | 137 |  |  | Net income
Total reclassifications for the period | $ | (19,646) |  |  | $ | (26,404) |  |  | $ | (9,234) |  |  | Net income

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