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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Within one year | $ 27,010 |
From one to five years | 53,895 |
From five to ten years | 171,942 |
After ten years | 377,227 |
Amortized cost | 630,074 | $ 783,599
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Within one year | 27,010 |
From one to five years | 54,358 |
From five to ten years | 175,630 |
After ten years | 384,264 |
Fair value | $ 641,262 | $ 778,675

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