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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
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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