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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2023
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 |  | Unrealized Gains and Losses on Held-to- Maturity Securities |  | Gains and Losses on Hedges |  | Defined Benefit Pension Plans |  | Total
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) |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (2,950) |  |  | $ | — |  |  | $ | 543 |  |  | $ | 32 |  |  | $ | (2,375) |
Other comprehensive income (loss) before reclassifications | (639,463) |  |  | (125,229) |  |  | (34,043) |  |  | — |  |  | (798,735) |
Amounts reclassified from AOCI to income (1) | 67 |  |  | 12,565 |  |  | 1,951 |  |  | 105 |  |  | 14,688 |
Balance at end of period | $ | (642,346) |  |  | $ | (112,664) |  |  | $ | (31,549) |  |  | $ | 137 |  |  | $ | (786,422) |
Year Ended December 31, 2021 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 145,335 |  |  | $ | — |  |  | $ | 2,584 |  |  | $ | (148) |  |  | $ | 147,771 |
Other comprehensive income (loss) before reclassifications | (144,948) |  |  | — |  |  | 1,433 |  |  | — |  |  | (143,515) |
Amounts reclassified from AOCI to income (1) | (3,337) |  |  | — |  |  | (3,474) |  |  | 180 |  |  | (6,631) |
Balance at end of period | $ | (2,950) |  |  | $ | — |  |  | $ | 543 |  |  | $ | 32 |  |  | $ | (2,375) |
(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) | 2023 |  | 2022 |  | 2021 |  |
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 | $ | (6,265) |  |  | $ | (88) |  |  | $ | 4,327 |  |  | Debt securities gains (losses), net
| 1,620 |  |  | 21 |  |  | (990) |  |  | Income tax (expense) benefit
| $ | (4,645) |  |  | $ | (67) |  |  | $ | 3,337 |  |  | Net income
Amortization of unrealized losses on held-to-maturity securities transferred from available-for-sale | $ | (21,239) |  |  | $ | (16,612) |  |  | $ | — |  |  | Interest income (expense)
| 5,372 |  |  | 4,047 |  |  | — |  |  | Income tax (expense) benefit
| $ | (15,867) |  |  | $ | (12,565) |  |  | $ | — |  |  | Net income
Gains and losses on hedges Interest rate contracts | $ | 15,067 |  |  | $ | (2,587) |  |  | $ | 4,605 |  |  | Interest income (expense)
| (3,926) |  |  | 636 |  |  | (1,131) |  |  | Income tax (expense) benefit
| $ | 11,141 |  |  | $ | (1,951) |  |  | $ | 3,474 |  |  | Net income
Amortization of defined benefit pension items |  |  |  |  |  |  |
Actuarial gains (losses) | $ | 182 |  |  | $ | (139) |  |  | $ | (239) |  |  | Salaries and employee benefits
| (45) |  |  | 34 |  |  | 59 |  |  | Income tax (expense) benefit
| $ | 137 |  |  | $ | (105) |  |  | $ | (180) |  |  | Net income
Total reclassifications for the period | $ | (9,234) |  |  | $ | (14,688) |  |  | $ | 6,631 |  |  | Net income

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