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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 1,137
From one to five years	19,997
From five to ten years	201,736
After ten years	851,018
Amortized cost	1,073,888	$ 968,554
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	1,179
From one to five years	20,682
From five to ten years	208,054
After ten years	878,528
Fair value	$ 1,108,443	$ 975,340

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