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Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2024
Equity [Abstract] |
Summary of Components of Other Comprehensive Income | The table below provides a summary of the components of other comprehensive income (“OCI”) for the periods presented.
|  | Three Months Ended September 30, |
|  | 2024 |  |  | 2023 |
|  | 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 |  | $ | 108,634 |  |  | $ | (32,116 | ) |  | $ | 76,518 |  |  | $ | (130,768 | ) |  | $ | 38,660 |  |  | $ | (92,108 | )
Net realized loss on investment securities reclassified into earnings |  |  | 11,582 |  |  |  | (3,424 | ) |  |  | 8,158 |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity |  |  | 174 |  |  |  | (52 | ) |  |  | 122 |  |  |  | (3,096 | ) |  |  | 3,234 |  |  |  | 138 |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | (28,688 | ) |  |  | 8,258 |  |  |  | (20,430 | ) |  |  | 13,739 |  |  |  | (4,031 | ) |  |  | 9,708 |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | (6,913 | ) |  |  | 2,044 |  |  |  | (4,869 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net change |  | $ | 84,789 |  |  | $ | (25,290 | ) |  | $ | 59,499 |  |  | $ | (120,125 | ) |  | $ | 37,863 |  |  | $ | (82,262 | )
|  | Nine Months Ended September 30, |
|  | 2024 |  |  | 2023 |
|  | 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 |  | $ | 70,485 |  |  | $ | (20,838 | ) |  | $ | 49,647 |  |  | $ | (128,340 | ) |  | $ | 37,942 |  |  | $ | (90,398 | )
Net realized loss on investment securities reclassified into earnings |  |  | 11,582 |  |  |  | (3,424 | ) |  |  | 8,158 |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity |  |  | 512 |  |  |  | (152 | ) |  |  | 360 |  |  |  | 714 |  |  |  | (212 | ) |  |  | 502 |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | (8,021 | ) |  |  | 2,350 |  |  |  | (5,671 | ) |  |  | 24,868 |  |  |  | (7,314 | ) |  |  | 17,554 |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | (5,329 | ) |  |  | 1,575 |  |  |  | (3,754 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net change |  | $ | 69,229 |  |  | $ | (20,489 | ) |  | $ | 48,740 |  |  | $ | (102,758 | ) |  | $ | 30,416 |  |  | $ | (72,342 | )

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