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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Within one year | $ 26,569 |
From one to five years | 60,261 |
From five to ten years | 159,181 |
After ten years | 375,348 |
Amortized cost | 621,359 | $ 630,074
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Within one year | 26,581 |
From one to five years | 60,859 |
From five to ten years | 164,806 |
After ten years | 390,079 |
Fair value | $ 642,325 | $ 641,262

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