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Securities - Investment Portfolio (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Securities      
Pretax realized losses on sale of available-for-sale securities $ 42 $ 1,010 $ 9
FHLB and FRB Stock      
FHLBC stock 3,700    
FRB stock $ 6,200 $ 6,200