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Fair Value Measurements - Quantitative and Qualitative Information of Level 3 Fair Value Measurements (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Valuation techniques    
Impaired loans $ 2,539,000 $ 3,027,000
Other real estate owned 0 $ 100,000
Real estate | Level 3 | Commercial Real Estate | Sales Comparison | Weighted Average    
Valuation techniques    
Range (as a percent)   (50.00%)
Non-recurring basis | Commercial | Level 3 | Commercial | Market Approach    
Valuation techniques    
Impaired loans $ 8,000  
Non-recurring basis | Commercial | Level 3 | Commercial | Market Approach | Weighted Average    
Valuation techniques    
Range (as a percent) 20.00%  
Non-recurring basis | Real estate | Level 3 | Commercial Real Estate | Sales Comparison    
Valuation techniques    
Impaired loans   $ 260,000
Non-recurring basis | Real estate | Level 3 | Commercial Real Estate | Sales Comparison | Weighted Average    
Valuation techniques    
Range (as a percent)   50.00%
Non-recurring basis | Real estate | Level 3 | Residential Real Estate | Sales Comparison    
Valuation techniques    
Impaired loans $ 33,000 $ 79,000
Non-recurring basis | Real estate | Level 3 | Residential Real Estate | Sales Comparison | Minimum    
Valuation techniques    
Range (as a percent)   20.00%
Non-recurring basis | Real estate | Level 3 | Residential Real Estate | Sales Comparison | Maximum    
Valuation techniques    
Range (as a percent)   60.00%
Non-recurring basis | Real estate | Level 3 | Residential Real Estate | Sales Comparison | Weighted Average    
Valuation techniques    
Range (as a percent) 0.00% 30.00%
Non-recurring basis | Other real estate owned: Commercial RE | Level 3 | Sales Comparison | Maximum    
Valuation techniques    
Range (as a percent)   40.00%
Non-recurring basis | Other real estate owned: Commercial RE | Level 3 | Commercial Real Estate | Sales Comparison    
Valuation techniques    
Other real estate owned   $ 100,000
Non-recurring basis | Other real estate owned: Commercial RE | Level 3 | Commercial Real Estate | Sales Comparison | Minimum    
Valuation techniques    
Range (as a percent)   8.00%
Non-recurring basis | Other real estate owned: Commercial RE | Level 3 | Commercial Real Estate | Sales Comparison | Weighted Average    
Valuation techniques    
Range (as a percent)   33.65%