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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 26, 2014
Subordinated Borrowing [Line Items]          
Borrowed funds   $ 69,680 $ 44,730    
Repayment of subordinated notes payable   0 0 $ 4,000  
Junior subordinated notes   10,004 9,990    
Debt issuance costs, unamortized   311      
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   $ 22,498 $ 22,440    
London Interbank Offered Rate (LIBOR) | Subordinated debt - third party financial institution          
Subordinated Borrowing [Line Items]          
Debt instrument, basis spread on variable rate 4.75%        
Aslin Group, Inc. | Subordinated Debt - Issued to fund mergers          
Subordinated Borrowing [Line Items]          
Subordinated notes payable         $ 15,000
Minimum | Interest rate floor debt | Subordinated debt - third party financial institution          
Subordinated Borrowing [Line Items]          
Fixed rate   6.00%