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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 919
From one to five years	111,381
From five to ten years	738,891
After ten years	843,615
Amortized cost	1,694,806	$ 1,318,711
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	920
From one to five years	111,252
From five to ten years	731,896
After ten years	843,293
Fair value	$ 1,687,361	$ 1,348,698

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