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Fair Value - Assets Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   $ 300,172 $ 298,999
U.S. Government-sponsored agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 4,979    
Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   289,989 288,789
Debt Securities, Available-for-sale 292,570    
State and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   6,769 6,842
Debt Securities, Available-for-sale 4,638    
Other equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   3,414 3,368
Total Fair Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   300,172 298,999
Debt Securities, Available-for-sale 305,444    
Derivative asset 2,888 1,955 1,592
Total Fair Value | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Derivative asset 0 0 0
Total Fair Value | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   300,172 298,999
Debt Securities, Available-for-sale 305,444    
Derivative asset 2,888 1,955 1,592
Total Fair Value | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Derivative asset 0 0 0
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
Debt Securities, Available-for-sale 0    
Total assets 0 0 0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset 0 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Government-sponsored agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0    
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Fair Value, Measurements, Recurring | Level 1 | State and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Fair Value, Measurements, Recurring | Level 1 | Other equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Fair Value, Measurements, Recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   300,172 298,999
Debt Securities, Available-for-sale 305,444    
Total assets 308,332 302,127 300,591
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset 2,888 1,955 1,592
Fair Value, Measurements, Recurring | Level 2 | U.S. Government-sponsored agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 4,979    
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   289,989 288,789
Debt Securities, Available-for-sale 292,570    
Fair Value, Measurements, Recurring | Level 2 | State and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   6,769 6,842
Debt Securities, Available-for-sale 4,638    
Fair Value, Measurements, Recurring | Level 2 | Other equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   3,414 3,368
Debt Securities, Available-for-sale 3,257    
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
Debt Securities, Available-for-sale 0    
Total assets 0 0 0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset 0 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Government-sponsored agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 0    
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Fair Value, Measurements, Recurring | Level 3 | State and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Fair Value, Measurements, Recurring | Level 3 | Other equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   0 0
Debt Securities, Available-for-sale 0    
Fair Value, Measurements, Recurring | Total Fair Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   300,172 298,999
Debt Securities, Available-for-sale 305,444    
Total assets 308,332 302,127 300,591
Fair Value, Measurements, Recurring | Total Fair Value | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset 2,888 1,955 1,592
Fair Value, Measurements, Recurring | Total Fair Value | U.S. Government-sponsored agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 4,979    
Fair Value, Measurements, Recurring | Total Fair Value | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   289,989 288,789
Debt Securities, Available-for-sale 292,570    
Fair Value, Measurements, Recurring | Total Fair Value | State and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   6,769 6,842
Debt Securities, Available-for-sale 4,638    
Fair Value, Measurements, Recurring | Total Fair Value | Other equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale   $ 3,414 $ 3,368
Debt Securities, Available-for-sale $ 3,257