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Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable $ 1,154,652 $ 1,146,627
Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 63,424 62,728
Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,263 2,169
Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 3,092 3,064
Nonperforming TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 5,431 5,414
Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 74,210 73,375
Commercial, financial, and agricultural    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 204,759 207,720
Commercial, financial, and agricultural | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 10,254 8,871
Commercial, financial, and agricultural | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 173 53
Commercial, financial, and agricultural | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 629 570
Commercial, financial, and agricultural | Nonperforming TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,747 1,857
Commercial, financial, and agricultural | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 12,803 11,351
Residential real estate | Construction    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 26,082 28,610
Residential real estate | Construction | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 583 588
Residential real estate | Construction | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Residential real estate | Construction | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Residential real estate | Construction | Nonperforming TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Residential real estate | Construction | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 583 588
Residential real estate | Mortgages    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 248,059 241,517
Residential real estate | Mortgages | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 11,831 12,790
Residential real estate | Mortgages | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,391 1,411
Residential real estate | Mortgages | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,048 2,073
Residential real estate | Mortgages | Nonperforming TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,803 2,720
Residential real estate | Mortgages | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 18,073 18,994
Commercial real estate | Construction    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 109,766 106,784
Commercial real estate | Construction | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 4,032 4,063
Commercial real estate | Construction | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Commercial real estate | Construction | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Commercial real estate | Construction | Nonperforming TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 151 153
Commercial real estate | Construction | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 4,183 4,216
Commercial real estate | Mortgages    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 534,121 529,536
Commercial real estate | Mortgages | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 36,716 36,408
Commercial real estate | Mortgages | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 696 702
Commercial real estate | Mortgages | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 373 377
Commercial real estate | Mortgages | Nonperforming TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 508 474
Commercial real estate | Mortgages | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 38,293 37,961
Installment and other consumer    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 31,865 32,460
Installment and other consumer | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 8 8
Installment and other consumer | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 3 3
Installment and other consumer | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 42 44
Installment and other consumer | Nonperforming TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 222 210
Installment and other consumer | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable $ 275 $ 265