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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 706
From one to five years	20,281
From five to ten years	356,717
After ten years	786,929
Amortized cost	1,164,633	$ 968,554
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	731
From one to five years	21,010
From five to ten years	362,435
After ten years	813,749
Fair value	$ 1,197,925	$ 975,340

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