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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Summary of Components of Other Comprehensive Income | The tables below provide a summary of the components of OCI for the periods presented.
|  | Year Ended December 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | Before-tax |  |  | Tax effect |  |  | After-tax |  |  | Before-tax |  |  | Tax effect |  |  | After-tax |  |  | Before-tax |  |  | Tax effect |  |  | After-tax |
|  | (Dollars in thousands) |
Investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  | $ | (26,274 | ) |  | $ | 7,768 |  |  | $ | (18,506 | ) |  | $ | 50,331 |  |  | $ | (14,880 | ) |  | $ | 35,451 |  |  | $ | (498,759 | ) |  | $ | 147,451 |  |  | $ | (351,308 | )
Net realized loss on investment securities reclassified into earnings |  |  | 28,317 |  |  |  | (8,372 | ) |  |  | 19,945 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity |  |  | 685 |  |  |  | (203 | ) |  |  | 482 |  |  |  | 914 |  |  |  | (270 | ) |  |  | 644 |  |  |  | 681 |  |  |  | (201 | ) |  |  | 480 |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | 14,160 |  |  |  | (4,212 | ) |  |  | 9,948 |  |  |  | (6,938 | ) |  |  | 2,070 |  |  |  | (4,868 | ) |  |  | — |  |  |  | — |  |  |  | — |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | (517 | ) |  |  | 153 |  |  |  | (364 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net change |  | $ | 16,371 |  |  | $ | (4,866 | ) |  | $ | 11,505 |  |  | $ | 44,306 |  |  | $ | (13,079 | ) |  | $ | 31,227 |  |  | $ | (498,078 | ) |  | $ | 147,250 |  |  | $ | (350,828 | )

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