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Loans and Allowance for Loan Losses - Summary of Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Financing Receivable Impaired [Line Items]        
Impaired loans with no related allowance recorded, Average recorded investment $ 1,351 $ 1,245 $ 1,381 $ 1,272
Impaired loans with no related allowance recorded, Interest income recognized 15   31  
Impaired loans with an allowance recorded, Average recorded investment 5,419 1,941 5,369 2,141
Impaired loans with an allowance recorded, Interest income recognized     118  
Average recorded investment 6,770 3,186 6,750 3,413
Interest income recognized 15   149  
Commercial real estate        
Financing Receivable Impaired [Line Items]        
Impaired loans with no related allowance recorded, Average recorded investment 1,159 1,245 1,189 1,272
Impaired loans with no related allowance recorded, Interest income recognized 15   25  
Consumer real estate        
Financing Receivable Impaired [Line Items]        
Impaired loans with no related allowance recorded, Average recorded investment 92   92  
Impaired loans with no related allowance recorded, Interest income recognized     3  
Commercial and industrial        
Financing Receivable Impaired [Line Items]        
Impaired loans with an allowance recorded, Average recorded investment 5,419 $ 1,941 5,369 $ 2,141
Impaired loans with an allowance recorded, Interest income recognized     118  
Consumer        
Financing Receivable Impaired [Line Items]        
Impaired loans with no related allowance recorded, Average recorded investment $ 100   100  
Impaired loans with no related allowance recorded, Interest income recognized     $ 3