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Borrowings (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Securities sold under repurchase agreements
item
Dec. 31, 2013
Securities sold under repurchase agreements
Sep. 30, 2014
Securities sold under repurchase agreements
Minimum
Sep. 30, 2014
Securities sold under repurchase agreements
Maximum
Sep. 30, 2014
FHLBC advances
Dec. 31, 2013
FHLBC advances
Sep. 30, 2014
Subordinated debt
Dec. 31, 2013
Subordinated debt
Sep. 30, 2014
Subordinated debt
LIBOR
Sep. 30, 2014
Notes payable and other borrowings
Dec. 31, 2013
Notes payable and other borrowings
Sep. 30, 2014
Bank of America credit facility
item
Dec. 31, 2012
Bank of America credit facility
item
Jan. 31, 2008
Senior debt facility
Sep. 30, 2014
Senior debt facility
LIBOR
Sep. 30, 2014
Senior debt facility
Prime rate
Sep. 30, 2014
Term debt
Sep. 30, 2014
Junior subordinated debentures
Dec. 31, 2013
Junior subordinated debentures
Borrowings                                          
Total borrowings $ 173,316,000 $ 131,438,000 $ 29,438,000 $ 22,560,000     $ 40,000,000 $ 5,000,000 $ 45,000,000 $ 45,000,000   $ 500,000 $ 500,000           $ 500,000 $ 58,378,000 $ 58,378,000
Maturity         1 day 90 days                              
Carrying amount of securities secured     29,400,000 22,600,000                                  
Fair value of the pledged collateral     43,400,000 39,200,000                                  
Number of customers having secured balances exceeding specified percentage of stockholders equity     0                                    
Borrowings at FHLBC as percentage of total assets             35.00%                            
Borrowings at FHLBC as percentage of book value of certain mortgage loans             60.00%                            
Amount available for additional borrowings             49,900,000                            
Bank owned FHLBC stock 4,300,000 5,500,000         4,300,000                            
Fair value of securities collateralized             93,100,000                            
Principal balance of loans collateralized             52,400,000                            
Combined collateral value             91,200,000                            
Maximum borrowing capacity                           45,500,000   30,500,000     500,000    
Face amount                 $ 45,000,000                        
Variable interest rate base                     three-month LIBOR           three-month LIBOR prime      
Basis points added to reference rate (as a percent)                     1.50%           0.90%   2.00%    
Number of financial covenants for which the entity continued to be out of compliance                           2 2