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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Investments, Debt and Equity Securities [Abstract] |  |
Held-to-maturity, amortized cost, one year or less | $ 5,821 |
Held-to-maturity, amortized cost, after one through five years | 10,708 |
Held-to-maturity, amortized cost, after five through ten years | 5,227 |
Held-to-maturity, amortized cost, after ten years | 291,836 |
Held-to-maturity, amortized cost, securities not due on a single maturity date | 22,354 |
Amortized Cost | 335,946 | $ 40,927
Held-to-maturity, fair value, one year or less | 5,895 |
Held-to-maturity, fair value, after one through five years | 11,199 |
Held-to-maturity, fair value, after five through ten years | 2,937 |
Held-to-maturity, fair value, after ten years | 298,857 |
Held-to-maturity, fair value, securities not due on a single maturity date | 23,037 |
Held-to-maturity, fair value, total | 341,925 | 41,855
Available-for-sale, amortized cost, one year or less | 14,017 |
Available-for-sale, amortized cost, after one through five years | 30,634 |
Available-for-sale, amortized cost, after five through ten years | 229,042 |
Available-for-sale, amortized cost, after ten years | 1,747,650 |
Available-for-sale, amortized cost, securities not due on a single maturity date | 1,374,769 |
Available-for-sale, amortized cost, other securities (no maturity) | 931 |
Amortized Cost | 3,397,043 | 3,263,151
Available-for-sale, fair value, one year or less | 14,089 |
Available-for-sale, fair value, after one through five years | 31,071 |
Available-for-sale, fair value, after five through ten years | 232,003 |
Available-for-sale, fair value, after ten years | 1,800,568 |
Available-for-sale, fair value, securities not due on a single maturity date | 1,394,936 |
Available-for-sale, fair value, other securities (no maturity) | 931 |
Available-for-sale, fair value, total | $ 3,473,598 | $ 3,288,343

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