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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2024
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
Three Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (652,518) |  |  | $ | (95,472) |  |  | $ | 9,181 |  |  | $ | — |  |  | $ | (738,809) |
Other comprehensive income (loss) before reclassifications | (33,463) |  |  | — |  |  | (14,205) |  |  | — |  |  | (47,668) |
Amounts reclassified from AOCI to income (1) | 12 |  |  | 3,221 |  |  | 3,616 |  |  | — |  |  | 6,849 |
Balance at end of period | $ | (685,969) |  |  | $ | (92,251) |  |  | $ | (1,408) |  |  | $ | — |  |  | $ | (779,628) |
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (642,346) |  |  | $ | (112,664) |  |  | $ | (31,549) |  |  | $ | 137 |  |  | $ | (786,422) |
Other comprehensive income (loss) before reclassifications | 27,219 |  |  | 1,325 |  |  | 35,985 |  |  | — |  |  | 64,529 |
Amounts reclassified from AOCI to income (1) | 3,867 |  |  | 4,373 |  |  | 5,436 |  |  | (141) |  |  | 13,535 |
Balance at end of period | $ | (611,260) |  |  | $ | (106,966) |  |  | $ | 9,872 |  |  | $ | (4) |  |  | $ | (708,358) |
(1)See table below for details about reclassifications to income.
Schedule of Reclassifications out of AOCI | The following table summarizes the amounts reclassified out of each component of AOCI for the three months ended March 31, 2024 and 2023:
| Three Months Ended March 31, |  |
(dollars in thousands) | 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 securities | $ | (16) |  |  | $ | (5,216) |  |  | Debt securities gains (losses), net
| 4 |  |  | 1,349 |  |  | Income tax (expense) benefit
| $ | (12) |  |  | $ | (3,867) |  |  | Net income
Amortization of unrealized losses on held-to-maturity securities transferred from available-for-sale | $ | (4,318) |  |  | $ | (5,829) |  |  | Interest income (expense)
| 1,097 |  |  | 1,456 |  |  | Income tax (expense) benefit
| $ | (3,221) |  |  | $ | (4,373) |  |  | Net income
Gains and losses on hedges Interest rate contracts | $ | (4,877) |  |  | $ | (7,292) |  |  | Interest income (expense)
| 1,261 |  |  | 1,856 |  |  | Income tax (expense) benefit
| $ | (3,616) |  |  | $ | (5,436) |  |  | Net income
Amortization of defined benefit pension items |  |  |  |  |
Actuarial gains (losses) | $ | — |  |  | $ | 188 |  |  | Salaries and employee benefits
| — |  |  | (47) |  |  | Income tax (expense) benefit
| $ | — |  |  | $ | 141 |  |  | Net income
Total reclassifications for the period | $ | (6,849) |  |  | $ | (13,535) |  |  | Net income

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