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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities $ 434,697,000   $ 535,281,000      
Equity securities 7,184,000   7,423,000      
Valuation allowance 9,025,000 $ 8,916,000 8,778,000 $ 8,920,000 $ 9,297,000 $ 9,326,000
Liabilities fair value nonrecurring 0   0      
Carrying Amount            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities 7,184,000   7,423,000      
Loans, net 902,852,000   891,901,000      
Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities 7,184,000   7,423,000      
Loans, net 896,241,000   899,191,000      
Loans, charge-offs 0 $ 0 0      
Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities     7,500,000      
Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 0   0      
Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities 0   0      
Loans, net 0   0      
Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities 0   0      
Loans, net 896,241,000   899,191,000      
Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 441,881,000   542,704,000      
Recurring | U.S. Government agencies | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 22,243,000   66,587,000      
Recurring | Obligations of states and political subdivisions | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 66,114,000   143,105,000      
Recurring | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 243,948,000   234,908,000      
Recurring | Private label mortgage and asset backed securities | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 102,392,000   90,681,000      
Recurring | Other equity securities | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities 7,184,000   7,423,000      
Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 7,184,000   7,423,000      
Recurring | Level 1 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt 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 debt securities 0   0      
Recurring | Level 1 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0   0      
Recurring | Level 1 | Private label mortgage and asset backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0   0      
Recurring | Level 1 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities 7,184,000   7,423,000      
Recurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 434,697,000   535,281,000      
Recurring | Level 2 | U.S. Government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 22,243,000   66,587,000      
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 debt securities 66,114,000   143,105,000      
Recurring | Level 2 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 243,948,000   234,908,000      
Recurring | Level 2 | Private label mortgage and asset backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 102,392,000   90,681,000      
Recurring | Level 2 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity 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 debt 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 debt securities 0   0      
Recurring | Level 3 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0   0      
Recurring | Level 3 | Private label mortgage and asset backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale debt securities 0   0      
Recurring | Level 3 | Other equity securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities 0   0      
Nonrecurring | Carrying Amount | Impaired Financing Receivable            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net 163,000          
Valuation allowance 163,000          
Nonrecurring | Carrying Amount | Impaired Financing Receivable            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net     0      
Nonrecurring | Fair Value            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets     70,000      
Assets, fair value     70,000      
Valuation allowance     0      
Nonrecurring | Fair Value | Impaired Financing Receivable            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans, net $ 0          
Nonrecurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets     0      
Assets, fair value     0      
Nonrecurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets     0      
Assets, fair value     0      
Nonrecurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other repossessed assets     70,000      
Assets, fair value     $ 70,000