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Investment Securities - AFS and Fair Value Option (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Estimated Fair Value    
Securities with a loss less than 12 months $ 11,098 $ 6,961
Securities with a loss greater than 12 months 6,077 1,889
Unrealized Losses    
Securities with a loss less than 12 months (1,626) (502)
Securities with a loss greater than 12 months $ (1,442) $ (308)