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Securities, HTM Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 18,088
From one to five years	58,963
From five to ten years	231,927
After ten years	307,582
Amortized cost	616,560	$ 630,074
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	18,104
From one to five years	60,483
From five to ten years	237,275
After ten years	320,965
Fair value	$ 636,827	$ 641,262

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