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Securities - Investment Portfolio (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Securities    
Pretax realized losses on sale of available-for-sale securities $ 578  
FHLB and FRB Stock    
FHLBC stock 5,000 $ 7,200
FRB stock $ 6,200