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Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2023
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, |
|  | 2023 |  |  | 2022 |
|  | 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 |  | $ | (130,768 | ) |  | $ | 38,660 |  |  | $ | (92,108 | ) |  | $ | (194,111 | ) |  | $ | 57,386 |  |  | $ | (136,725 | )
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity |  |  | (3,096 | ) |  |  | 3,234 |  |  |  | 138 |  |  |  | 95 |  |  |  | (28 | ) |  |  | 67 |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | 13,739 |  |  |  | (4,031 | ) |  |  | 9,708 |  |  |  | — |  |  |  | — |  |  |  | — |
Net change |  | $ | (120,125 | ) |  | $ | 37,863 |  |  | $ | (82,262 | ) |  | $ | (194,016 | ) |  | $ | 57,358 |  |  | $ | (136,658 | )
|  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |
|  | 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 |  | $ | (128,340 | ) |  | $ | 37,942 |  |  | $ | (90,398 | ) |  | $ | (539,066 | ) |  | $ | 159,367 |  |  | $ | (379,699 | )
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity |  |  | 714 |  |  |  | (212 | ) |  |  | 502 |  |  |  | 242 |  |  |  | (72 | ) |  |  | 170 |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  |  | 24,868 |  |  |  | (7,314 | ) |  |  | 17,554 |  |  |  | — |  |  |  | — |  |  |  | — |
Net change |  | $ | (102,758 | ) |  | $ | 30,416 |  |  | $ | (72,342 | ) |  | $ | (538,825 | ) |  | $ | 159,296 |  |  | $ | (379,529 | )

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