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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |
Held-to-maturity, amortized cost, one year or less | $ 5,644 |
Held-to-maturity, amortized cost, after one through five years | 7,676 |
Held-to-maturity, amortized cost, after five through ten years | 27,094 |
Held-to-maturity, amortized cost, after ten years | 1,419,732 |
Held-to-maturity, amortized cost, securities not due on a single maturity date | 57,930 |
Amortized Cost | 1,518,076 | $ 335,946
Held-to-maturity, fair value, one year or less | 5,678 |
Held-to-maturity, fair value, after one through five years | 7,993 |
Held-to-maturity, fair value, after five through ten years | 26,019 |
Held-to-maturity, fair value, after ten years | 1,390,903 |
Held-to-maturity, fair value, securities not due on a single maturity date | 57,323 |
Held-to-maturity, fair value, total | 1,487,916 | 341,925
Available-for-sale, amortized cost, one year or less | 8,385 |
Available-for-sale, amortized cost, after one through five years | 53,515 |
Available-for-sale, amortized cost, after five through ten years | 487,966 |
Available-for-sale, amortized cost, after ten years | 1,853,165 |
Available-for-sale, amortized cost, securities not due on a single maturity date | 4,434,981 |
Available-for-sale, amortized cost, other securities (no maturity) | 731 |
Amortized Cost | 6,838,743 | 3,397,043
Available-for-sale, fair value, one year or less | 8,423 |
Available-for-sale, fair value, after one through five years | 54,008 |
Available-for-sale, fair value, after five through ten years | 492,654 |
Available-for-sale, fair value, after ten years | 1,844,768 |
Available-for-sale, fair value, securities not due on a single maturity date | 4,421,620 |
Available-for-sale, fair value, other securities (no maturity) | 730 |
Available-for-sale, fair value, total | $ 6,822,203 | $ 3,473,598

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