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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Held-to-maturity, amortized cost, one year or less | $ 1,940 |
Held-to-maturity, amortized cost, after one through five years | 88,294 |
Held-to-maturity, amortized cost, after five through ten years | 381,912 |
Held-to-maturity, amortized cost, after ten years | 2,098,454 |
Held-to-maturity, amortized cost, securities not due on a single maturity date | 1,048,170 |
Amortized Cost | 3,618,770 | $ 3,639,850
Held-to-maturity, fair value, one year or less | 1,936 |
Held-to-maturity, fair value, after one through five years | 83,044 |
Held-to-maturity, fair value, after five through ten years | 337,841 |
Held-to-maturity, fair value, after ten years | 1,569,609 |
Held-to-maturity, fair value, securities not due on a single maturity date | 937,195 |
Held-to-maturity, fair value, total | 2,929,625 | 2,949,951
Available-for-sale, amortized cost, one year or less | 4,510 |
Available-for-sale, amortized cost, after one through five years | 107,184 |
Available-for-sale, amortized cost, after five through ten years | 193,731 |
Available-for-sale, amortized cost, after ten years | 1,014,687 |
Available-for-sale, amortized cost, securities not due on a single maturity date | 1,508,611 |
Available-for-sale, amortized cost, other securities (no maturity) | 217 |
Amortized Cost | 2,828,940 | 2,852,774
Available-for-sale, fair value, one year or less | 4,480 |
Available-for-sale, fair value, after one through five years | 106,936 |
Available-for-sale, fair value, after five through ten years | 182,383 |
Available-for-sale, fair value, after ten years | 816,920 |
Available-for-sale, fair value, securities not due on a single maturity date | 1,380,913 |
Available-for-sale, fair value, other securities (no maturity) | 217 |
Available-for-sale, fair value, total | $ 2,491,849 | $ 2,529,426

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