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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Within one year | $ 78,118 |
From one to five years | 64,632 |
From five to ten years | 204,726 |
After ten years | 433,089 |
Amortized cost | 780,565 | $ 783,599
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Within one year | 78,118 |
From one to five years | 64,930 |
From five to ten years | 204,881 |
After ten years | 434,832 |
Fair value | $ 782,761 | $ 778,675

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