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Fair Value - Assets Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 325,276 $ 317,416 $ 300,839
Securities available for sale     300,839
U.S. Government-sponsored agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 5,016 5,007  
Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 315,423 307,693 295,328
State and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 4,837 4,716 5,511
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  
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 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  
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  
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 325,276 317,416  
Securities available for sale     300,839
Total assets 326,508 319,236 303,280
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset 1,232 1,820 2,441
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 5,016 5,007  
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 315,423 307,693  
Securities available for sale     295,328
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 4,837 4,716  
Securities available for sale     5,511
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  
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 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  
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  
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 325,276 317,416  
Securities available for sale     300,839
Total assets 326,508 319,236 303,280
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 1,232 1,820 2,441
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 5,016 5,007  
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 315,423 307,693  
Securities available for sale     295,328
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 $ 4,837 $ 4,716  
Securities available for sale     $ 5,511