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Loans and Allowance for Loan Losses - Summary of Impaired Loans Evaluated for Specific Loss Allowance (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, Recorded investment $ 3,093 $ 3,898
Impaired loans with no related allowance recorded, Unpaid principal balance 4,808 9,403
Impaired loans with an allowance recorded, Related allowance 191  
Impaired loans with an allowance recorded, Recorded investment 742  
Impaired loans with an allowance recorded, Unpaid principal balance 5,419  
Recorded investment 3,835 3,898
Unpaid principal balance 10,227 9,403
Commercial real estate    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, Recorded investment 1,371 1,391
Impaired loans with no related allowance recorded, Unpaid principal balance 1,751 1,775
Consumer real estate    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, Recorded investment 953 922
Impaired loans with no related allowance recorded, Unpaid principal balance 1,466 1,204
Construction and land development    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, Recorded investment 8 8
Impaired loans with no related allowance recorded, Unpaid principal balance 25 18
Commercial and industrial    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, Recorded investment 714 1,546
Impaired loans with no related allowance recorded, Unpaid principal balance 1,489 6,350
Impaired loans with an allowance recorded, Related allowance 191  
Impaired loans with an allowance recorded, Recorded investment 742  
Impaired loans with an allowance recorded, Unpaid principal balance 5,419  
Consumer    
Financing Receivable Impaired [Line Items]    
Impaired loans with no related allowance recorded, Recorded investment 47 31
Impaired loans with no related allowance recorded, Unpaid principal balance $ 77 $ 56