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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 112
From one to five years	159,032
From five to ten years	780,821
After ten years	821,207
Amortized cost	1,761,172	$ 1,694,806
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	116
From one to five years	151,684
From five to ten years	732,172
After ten years	778,725
Fair value	$ 1,662,697	$ 1,687,361

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