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Borrowings - Additional information (Details)
9 Months Ended
Sep. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Jan. 31, 2008
USD ($)
Borrowings      
Bank owned FHLBC stock $ 3,200,000 $ 3,700,000  
Total borrowings 149,685,000 152,113,000  
Securities sold under repurchase agreements      
Borrowings      
Carrying amount of securities secured 46,600,000 34,100,000  
Fair value of the pledged collateral $ 47,600,000 45,400,000  
Number of customers having secured balances exceeding specified percentage of stockholders equity | item 1    
Total borrowings $ 46,606,000 34,070,000  
Securities sold under repurchase agreements | Minimum      
Borrowings      
Threshold percentage of stockholders' equity 10.00%    
FHLBC advances      
Borrowings      
Borrowings at FHLBC as percentage of total assets 35.00%    
Borrowings at FHLBC as percentage of book value of certain mortgage loans 60.00%    
FHLBC advance amount   15,000,000  
Bank owned FHLBC stock $ 3,200,000    
Fair value of securities collateralized 65,400,000    
Principal balance of loans collateralized 176,400,000    
Combined collateral value 178,600,000    
Amount available for additional borrowings 142,300,000    
Total borrowings   15,000,000  
Subordinated debt      
Borrowings      
Face amount 45,000,000    
Total borrowings $ 45,000,000 45,000,000  
Subordinated debt | LIBOR      
Borrowings      
Variable interest rate base three-month LIBOR    
Basis points added to reference rate (as a percent) 1.50%    
Notes payable and other borrowings      
Borrowings      
Total borrowings $ 500,000 500,000  
Correspondent Bank      
Borrowings      
Maximum borrowing capacity $ 45,500,000    
Senior debt facility      
Borrowings      
Maximum borrowing capacity     $ 30,500,000
Senior debt facility | LIBOR      
Borrowings      
Variable interest rate base three-month LIBOR    
Basis points added to reference rate (as a percent) 0.90%    
Senior debt facility | Prime rate      
Borrowings      
Variable interest rate base prime    
Term debt      
Borrowings      
Maximum borrowing capacity $ 500,000    
Total borrowings 500,000 500,000  
Junior subordinated debentures      
Borrowings      
Total borrowings $ 57,579,000 $ 57,543,000