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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 1,710
From one to five years	22,127
From five to ten years	572,232
After ten years	784,283
Amortized cost	1,380,352	$ 1,318,711
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	1,724
From one to five years	22,984
From five to ten years	564,112
After ten years	798,208
Fair value	$ 1,387,028	$ 1,348,698

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