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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 438
From one to five years	21,476
From five to ten years	545,330
After ten years	751,467
Amortized cost	1,318,711	$ 968,554
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	449
From one to five years	22,324
From five to ten years	551,215
After ten years	774,710
Fair value	$ 1,348,698	$ 975,340

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