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Securities - Investment Portfolio (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Securities      
Pretax realized losses on sale of available-for-sale securities $ 9 $ 1,893 $ 3,888
FHLB and FRB Stock      
FHLBC stock 7,200 5,400  
FRB stock $ 6,200 $ 4,800