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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Within one year | $ 18,088 |
From one to five years | 58,963 |
From five to ten years | 231,927 |
After ten years | 307,582 |
Amortized cost | 616,560 | $ 630,074
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Within one year | 18,104 |
From one to five years | 60,483 |
From five to ten years | 237,275 |
After ten years | 320,965 |
Fair value | $ 636,827 | $ 641,262

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