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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 26,940
From one to five years	68,113
From five to ten years	179,381
After ten years	404,001
Amortized cost	678,435	$ 783,599
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	26,940
From one to five years	68,531
From five to ten years	183,425
After ten years	412,293
Fair value	$ 691,189	$ 778,675

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