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Securities Fair Value Option Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value Option Securities [Line Items]    
Fair value option securities, Fair Value $ 60,432 $ 114,982
Residential agency mortgage-backed securities [Member]    
Fair Value Option Securities [Line Items]    
Fair value option securities, Fair Value 60,432 114,982
Fair value option securities, Net Unrealized Gain (Loss) $ 2,596 $ 4,463