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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Held-to-maturity, amortized cost, one year or less | $ 1,570 |
Held-to-maturity, amortized cost, after one through five years | 13,708 |
Held-to-maturity, amortized cost, after five through ten years | 394,392 |
Held-to-maturity, amortized cost, after ten years | 2,158,450 |
Held-to-maturity, amortized cost, securities not due on a single maturity date | 1,142,352 |
Amortized Cost | 3,710,472 | $ 3,729,502
Held-to-maturity, fair value, one year or less | 1,516 |
Held-to-maturity, fair value, after one through five years | 13,065 |
Held-to-maturity, fair value, after five through ten years | 347,677 |
Held-to-maturity, fair value, after ten years | 1,670,987 |
Held-to-maturity, fair value, securities not due on a single maturity date | 1,016,037 |
Held-to-maturity, fair value, total | 3,049,282 | 3,135,370
Available-for-sale, amortized cost, one year or less | 10,034 |
Available-for-sale, amortized cost, after one through five years | 116,012 |
Available-for-sale, amortized cost, after five through ten years | 213,380 |
Available-for-sale, amortized cost, after ten years | 1,006,399 |
Available-for-sale, amortized cost, securities not due on a single maturity date | 2,048,895 |
Available-for-sale, amortized cost, other securities (no maturity) | 251 |
Amortized Cost | 3,394,971 | 3,509,709
Available-for-sale, fair value, one year or less | 9,778 |
Available-for-sale, fair value, after one through five years | 115,248 |
Available-for-sale, fair value, after five through ten years | 188,442 |
Available-for-sale, fair value, after ten years | 868,475 |
Available-for-sale, fair value, securities not due on a single maturity date | 1,845,364 |
Available-for-sale, fair value, other securities (no maturity) | 251 |
Available-for-sale, fair value, total | $ 3,027,558 | $ 3,152,153

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