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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 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 |  |  |  | Total
Three Months Ended March 31, 2025 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (668,063) |  |  | $ | (82,294) |  |  | $ | 4,314 |  |  |  |  | $ | (746,043) |
Other comprehensive income (loss) before reclassifications | 85,228 |  |  | — |  |  | 8,442 |  |  |  |  | 93,670 |
Amounts reclassified from AOCI to income (1) | 56 |  |  | 2,921 |  |  | 887 |  |  |  |  | 3,864 |
Balance at end of period | $ | (582,779) |  |  | $ | (79,373) |  |  | $ | 13,643 |  |  |  |  | $ | (648,509) |
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) |
(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, 2025 and 2024:
| Three Months Ended March 31, |  |
(dollars in thousands) | 2025 |  | 2024 |  |
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 | $ | (76) |  |  | $ | (16) |  |  | Debt securities gains (losses), net
| 20 |  |  | 4 |  |  | Income tax (expense) benefit
| $ | (56) |  |  | $ | (12) |  |  | Net income
Amortization of unrecognized losses on held-to-maturity securities transferred from available-for-sale | $ | (3,915) |  |  | $ | (4,318) |  |  | Interest income (expense)
| 994 |  |  | 1,097 |  |  | Income tax (expense) benefit
| $ | (2,921) |  |  | $ | (3,221) |  |  | Net income
Gains and losses on hedges Interest rate contracts | $ | (1,196) |  |  | $ | (4,877) |  |  | Interest income (expense)
| 309 |  |  | 1,261 |  |  | Income tax (expense) benefit
| $ | (887) |  |  | $ | (3,616) |  |  | Net income
Total reclassifications for the period | $ | (3,864) |  |  | $ | (6,849) |  |  | Net income

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