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Securities - Investment Portfolio (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securities      
Available-for-sale Securities $ 531,838 $ 456,066  
Pretax realized losses on sale of available-for-sale securities 3,888 284 $ 1,512
FHLB and FRB Stock      
FHLBC stock 3,100 3,700  
FRB stock $ 4,800 $ 4,800