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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Within one year | $ 919 |
From one to five years | 111,381 |
From five to ten years | 738,891 |
After ten years | 843,615 |
Amortized cost | 1,694,806 | $ 1,318,711
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Within one year | 920 |
From one to five years | 111,252 |
From five to ten years | 731,896 |
After ten years | 843,293 |
Fair value | $ 1,687,361 | $ 1,348,698

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