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Fair Value Disclosures - Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis(Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale $ 300,172 $ 300,416    
Allowance for loan losses, other real estate owned 53 205 $ 162 $ 654
Allowance for impaired loans 1,531 478    
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Interest rate swap agreements 0 0    
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 300,172 300,416    
Interest rate swap agreements 1,955 1,790    
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Interest rate swap agreements 0 0    
Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 300,172 300,416    
Interest rate swap agreements 1,955 1,790    
Mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 289,989 280,604    
State and political subdivisions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 6,769 16,482    
Fair Value, Measurements, Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Assets measured at fair value 0 0    
Fair Value, Measurements, Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 300,172 300,416    
Assets measured at fair value 302,127 302,206    
Fair Value, Measurements, Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Assets measured at fair value 0 0    
Fair Value, Measurements, Recurring | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 300,172 300,416    
Assets measured at fair value 302,127 302,206    
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 0 0    
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 1,955 1,790    
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 0 0    
Fair Value, Measurements, Recurring | Interest Rate Swap | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate swap agreements 1,955 1,790    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 289,989 280,604    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 289,989 280,604    
Fair Value, Measurements, Recurring | State and political subdivisions | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | State and political subdivisions | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 6,769 16,482    
Fair Value, Measurements, Recurring | State and political subdivisions | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | State and political subdivisions | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 6,769 16,482    
Fair Value, Measurements, Recurring | Other equity securities | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | Other equity securities | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 3,414 3,330    
Fair Value, Measurements, Recurring | Other equity securities | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Fair Value, Measurements, Recurring | Other equity securities | Estimate of Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 3,414 3,330    
Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other real estate owned 1,012 375    
Impaired loans 6,521 827    
Assets measured at fair value 7,533 1,202    
Fair Value, Measurements, Nonrecurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other real estate owned 0 0    
Impaired loans 0 0    
Assets measured at fair value 0 0    
Fair Value, Measurements, Nonrecurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other real estate owned 1,012 375    
Impaired loans 6,521 827    
Assets measured at fair value 7,533 1,202    
Fair Value, Measurements, Nonrecurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other real estate owned 0 0    
Impaired loans 0 0    
Assets measured at fair value $ 0 $ 0