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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities $ 515,077,000   $ 547,749,000      
Valuation allowance 8,916,000 $ 9,299,000 9,326,000 $ 9,297,000 $ 9,872,000 $ 9,610,000
Assets fair value nonrecurring 194,000          
Liabilities fair value nonrecurring 0   0      
Carrying Amount            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 515,077,000   547,749,000      
Loans, net 769,810,000   747,302,000      
Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 515,077,000   547,749,000      
Loans, net 781,683,000   761,023,000      
Loans, charge-offs 0 $ 0 0      
Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 7,486,000   7,416,000      
Loans, net 0   0      
Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 507,591,000   540,333,000      
Loans, net 0   0      
Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Loans, net 781,683,000   761,023,000      
Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 515,077,000   547,749,000      
Recurring | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 61,804,000   68,970,000      
Recurring | Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 212,985,000   290,299,000      
Recurring | U.S. Government agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 188,349,000   178,221,000      
Recurring | Private label mortgage backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 44,453,000   2,843,000      
Recurring | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 7,486,000   7,416,000      
Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 7,486,000   7,416,000      
Recurring | Level 1 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 1 | Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 1 | U.S. Government agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 1 | Private label mortgage backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 1 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 7,486,000   7,416,000      
Recurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 507,591,000   540,333,000      
Recurring | Level 2 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 61,804,000   68,970,000      
Recurring | Level 2 | Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 212,985,000   290,299,000      
Recurring | Level 2 | U.S. Government agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 188,349,000   178,221,000      
Recurring | Level 2 | Private label mortgage backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 44,453,000   2,843,000      
Recurring | Level 2 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 0   0      
Recurring | Level 3 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 3 | Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 3 | U.S. Government agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 3 | Private label mortgage backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Recurring | Level 3 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Nonrecurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets 194,000   362,000      
Other real estate owned 0          
Assets, fair value 210,000   409,000      
Nonrecurring | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Valuation allowance     15,000      
Nonrecurring | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 16,000   47,000      
Nonrecurring | Impaired loans | Carrying Amount            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 45,000   62,000      
Valuation allowance 29,000   15,000      
Nonrecurring | Impaired loans | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 16,000   47,000      
Nonrecurring | Equity loans and lines of credit | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 16,000   47,000      
Nonrecurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets 0   0      
Other real estate owned 0          
Assets, fair value 0   0      
Nonrecurring | Level 1 | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 0   0      
Nonrecurring | Level 1 | Equity loans and lines of credit | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 0   0      
Nonrecurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets 0   0      
Other real estate owned 0          
Assets, fair value 0   0      
Nonrecurring | Level 2 | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 0   0      
Nonrecurring | Level 2 | Equity loans and lines of credit | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 0   0      
Nonrecurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets 194,000   362,000      
Other real estate owned 0          
Assets, fair value 210,000   409,000      
Nonrecurring | Level 3 | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 16,000   47,000      
Nonrecurring | Level 3 | Equity loans and lines of credit | Impaired loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net $ 16,000   $ 47,000