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Investment Securities - AFS and Fair Value Option (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Estimated Fair Value    
Securities with a loss less than 12 months $ 2,478 $ 438
Securities with a loss greater than 12 months 0 1,195
Unrealized Losses    
Securities with a loss less than 12 months (99) (25)
Securities with a loss greater than 12 months $ 0 $ (41)