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Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
contract
loan
Sep. 30, 2016
contract
Sep. 30, 2017
USD ($)
contract
loan
Sep. 30, 2016
contract
Dec. 31, 2016
USD ($)
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Specific reserve allocations for TDR's $ 254   $ 254   $ 348
Troubled debt restructuring loans $ 8,000   $ 8,000   8,800
Number of additional restructured loans | loan     2    
Number of loans to defaulted borrowers | loan 0        
Number of Contracts | contract 1   1    
Pre-Modification Outstanding Recorded Investment $ 147   $ 147    
Post-Modification Outstanding Recorded Investment 147   147    
Commercial          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Troubled debt restructuring loans 147   $ 147    
Residential          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Concentration risk, percentage     56.00%    
Borrower One | Acquisition & Development          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Loans defaulted under the restructured terms     $ 1,700   1,700
Accruing          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Troubled debt restructuring loans $ 6,200   $ 6,200   $ 5,900
Troubled Debt Restructured Loans          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract   0   0  
Portfolio Risk | Troubled Debt Restructured Loans | Accruing          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Concentration risk, percentage     48.00%   49.00%
Portfolio Risk | Troubled Debt Restructured Loans | Accruing | Commercial          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract 1   1    
Pre-Modification Outstanding Recorded Investment $ 147   $ 147    
Post-Modification Outstanding Recorded Investment $ 147   $ 147    
Portfolio Risk | Troubled Debt Restructured Loans | Accruing | Commercial | Commercial Business          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract 1   1    
Pre-Modification Outstanding Recorded Investment $ 147   $ 147    
Post-Modification Outstanding Recorded Investment $ 147   $ 147    
Portfolio Risk | Troubled Debt Restructured Loans | Accruing | Commercial | Commercial Real Estate          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract 0   0    
Pre-Modification Outstanding Recorded Investment $ 0   $ 0    
Post-Modification Outstanding Recorded Investment $ 0   $ 0    
Portfolio Risk | Troubled Debt Restructured Loans | Accruing | Commercial | Acquisition & Development          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract 0   0    
Pre-Modification Outstanding Recorded Investment $ 0   $ 0    
Post-Modification Outstanding Recorded Investment $ 0   $ 0    
Portfolio Risk | Troubled Debt Restructured Loans | Accruing | Residential          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract 0   0    
Pre-Modification Outstanding Recorded Investment $ 0   $ 0    
Post-Modification Outstanding Recorded Investment $ 0   $ 0    
Portfolio Risk | Troubled Debt Restructured Loans | Accruing | Home Equity          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract 0   0    
Pre-Modification Outstanding Recorded Investment $ 0   $ 0    
Post-Modification Outstanding Recorded Investment $ 0   $ 0    
Portfolio Risk | Troubled Debt Restructured Loans | Accruing | Consumer          
Details related to loans identified as Troubled Debt Restructurings (TDRs):          
Number of Contracts | contract 0   0    
Pre-Modification Outstanding Recorded Investment $ 0   $ 0    
Post-Modification Outstanding Recorded Investment $ 0   $ 0