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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale, Amortized Cost |  |
Within one year | $ 148,758 |
One to five years | 2,625,098 |
Five to ten years | 1,827,081 |
Beyond ten years | 2,363,629 |
Total | 6,964,566 | $ 5,784,754
Available-for-sale, Fair Value |  |
Within one year | 150,704 |
One to five years | 2,657,122 |
Five to ten years | 1,816,752 |
Beyond ten years | 2,403,372 |
Total | $ 7,027,950 | $ 5,970,115
Available-for-sale, Weighted Average Yield |  |
Within one year | 2.56% |
One to five years | 2.01% |
Five to ten years | 1.82% |
Beyond ten years | 2.43% |
Total | 2.11% |

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