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FHLB Advances, Other Borrowings and Junior Subordinated Notes Subordinated notes payable and junior subordinated notes payable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Aug. 26, 2014
Subordinated Borrowing [Line Items]            
Borrowed funds $ 44,309 $ 45,541 $ 44,309      
Repayment of subordinated notes payable   0 4,000 $ 0    
Junior subordinated notes 10,315 10,315 10,315      
Debt issuance cost         $ 428  
Debt issuance costs, unamortized   324        
Subordinated Debt            
Subordinated Borrowing [Line Items]            
Fixed rate           6.50%
Subordinated debt - third party financial institution            
Subordinated Borrowing [Line Items]            
Subordinated notes payable   1,700        
Subordinated debt - private placement            
Subordinated Borrowing [Line Items]            
Subordinated notes payable   6,200        
Junior subordinated notes            
Subordinated Borrowing [Line Items]            
Junior subordinated notes   $ 10,315        
Fixed rate   10.50%        
Subordinated debt - private placement            
Subordinated Borrowing [Line Items]            
Subordinated debt, fixed interest rate   7.50%        
Subordinated Debt            
Subordinated Borrowing [Line Items]            
Borrowed funds $ 22,926 $ 22,926 $ 22,926      
London Interbank Offered Rate (LIBOR) | Subordinated debt - third party financial institution            
Subordinated Borrowing [Line Items]            
Debt instrument, basis spread on variable rate 4.75%          
Interest rate floor debt | Subordinated debt - third party financial institution            
Subordinated Borrowing [Line Items]            
Interest rate floor   6.00%        
Aslin Group, Inc. | Subordinated Debt - Issued to fund mergers            
Subordinated Borrowing [Line Items]            
Subordinated notes payable           $ 15,000