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Loans and Allowance for Loan Losses (Details 7) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable $ 1,084,326 $ 1,068,432
Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 66,142 71,786
Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 4,373 4,121
Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 4,611 4,684
Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 5,482 5,672
Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 80,608 86,263
Commercial Financial And Agricultural    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 190,720 192,238
Commercial Financial And Agricultural | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 9,460 9,868
Commercial Financial And Agricultural | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 641 658
Commercial Financial And Agricultural | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 481 500
Commercial Financial And Agricultural | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,258 2,507
Commercial Financial And Agricultural | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 12,840 13,533
Residential Real Estate | Construction    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 29,351 26,492
Residential Real Estate | Construction | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,227 1,459
Residential Real Estate | Construction | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 462 462
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 | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 59 0
Residential Real Estate | Construction | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,748 1,921
Residential Real Estate | Mortgage    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 250,131 246,754
Residential Real Estate | Mortgage | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 8,079 9,978
Residential Real Estate | Mortgage | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,532 2,262
Residential Real Estate | Mortgage | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 3,068 3,116
Residential Real Estate | Mortgage | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 2,089 1,956
Residential Real Estate | Mortgage | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 15,768 17,312
Commercial Real Estate | Construction    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 105,345 98,340
Commercial Real Estate | Construction | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,291 1,284
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 | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 97
Commercial Real Estate | Construction | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,291 1,381
Commercial Real Estate | Mortgage    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 476,511 472,455
Commercial Real Estate | Mortgage | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 45,938 49,197
Commercial Real Estate | Mortgage | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 725 723
Commercial Real Estate | Mortgage | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 1,062 1,068
Commercial Real Estate | Mortgage | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 916 936
Commercial Real Estate | Mortgage | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 48,641 51,924
Installment and Other Consumer    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 32,268 32,153
Installment and Other Consumer | Watch    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 147 0
Installment and Other Consumer | Substandard    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 13 16
Installment and Other Consumer | Performing TDRs    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 0 0
Installment and Other Consumer | Non-accrual    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable 160 176
Installment and Other Consumer | Total    
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment    
Financing receivable $ 320 $ 192