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Borrowings - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Borrowings    
Total borrowings $ 165,952 $ 169,914
Securities sold under repurchase agreements    
Borrowings    
Total borrowings 27,074 21,036
FHLBC advances    
Borrowings    
Total borrowings 35,000 45,000
Junior subordinated debentures    
Borrowings    
Total borrowings 58,378 58,378
Subordinated debt    
Borrowings    
Total borrowings 45,000 45,000
Notes payable and other borrowings    
Borrowings    
Total borrowings $ 500 $ 500