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Fair Value Measurements - Nonrecurring (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Assets and liabilities measured at fair value            
Valuation allowance $ 6,000 $ 1,049,000        
Carrying value of other real estate owned 9,024,000 11,916,000 $ 11,724,000 $ 14,144,000 $ 16,252,000 $ 19,141,000
OREO Valuation allowance 8,803,000 9,982,000 $ 8,304,000 $ 13,254,000 $ 13,377,000 $ 14,127,000
Nonrecurring            
Assets and liabilities measured at fair value            
Total 9,069,000 11,916,000        
Nonrecurring | Impaired loans            
Assets and liabilities measured at fair value            
Total 45,000          
Valuation allowance 6,000 1,000,000        
Increase (decrease) of specific allocations within the provision for loan losses 92,000 1,000,000        
Nonrecurring | Impaired loans | Carrying Amount            
Assets and liabilities measured at fair value            
Total 51,000          
Nonrecurring | Other real estate owned            
Assets and liabilities measured at fair value            
Total 9,024,000 11,916,000        
Carrying value of other real estate owned 9,000,000 11,900,000        
Outstanding balance 18,700,000 23,500,000        
OREO Valuation allowance 8,800,000 10,000,000        
OREO participations 900,000,000,000 1,600,000        
Nonrecurring | Level 3            
Assets and liabilities measured at fair value            
Total 9,069,000 11,916,000        
Nonrecurring | Level 3 | Impaired loans            
Assets and liabilities measured at fair value            
Total 45,000          
Nonrecurring | Level 3 | Other real estate owned            
Assets and liabilities measured at fair value            
Total $ 9,024,000 $ 11,916,000