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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Within one year | $ 60,959 |
From one to five years | 67,594 |
From five to ten years | 190,717 |
After ten years | 425,331 |
Amortized cost | 744,601 | $ 783,599
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Within one year | 60,959 |
From one to five years | 68,031 |
From five to ten years | 193,697 |
After ten years | 432,308 |
Fair value | $ 754,995 | $ 778,675

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