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Loans Receivable and Allowance for Loan Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 760,414 $ 710,261
Non-Accrual 1,983 1,926
Total Past Due and Non-Accrual 3,921 3,844
Total Loans 764,335 714,105
Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 1,310 1,613
Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 132 304
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 496 1
Residential Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 233,291 234,790
Non-Accrual 1,706 1,136
Total Past Due and Non-Accrual 2,468 2,387
Total Loans 235,759 237,177
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 594 986
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 81 264
Residential Real Estate Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 87 1
Commercial Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 341,602 318,979
Non-Accrual 277 762
Total Past Due and Non-Accrual 1,332 1,208
Total Loans 342,934 320,187
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 646 445
Commercial Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 1
Commercial Real Estate Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 409 0
Construction Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 17,228 19,681
Non-Accrual 0 28
Total Past Due and Non-Accrual   28
Total Loans 17,228 19,709
Construction Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due   0
Construction Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Construction Real Estate Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Commercial, Financial And Agricultural [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 97,424 85,355
Non-Accrual 0 0
Total Past Due and Non-Accrual 37 153
Total Loans 97,461 85,508
Commercial, Financial And Agricultural [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 10 143
Commercial, Financial And Agricultural [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 27 10
Commercial, Financial And Agricultural [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 0 0
Consumer Loans To Individuals [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 70,869 51,456
Non-Accrual 0 0
Total Past Due and Non-Accrual 84 68
Total Loans 70,953 51,524
Consumer Loans To Individuals [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 60 39
Consumer Loans To Individuals [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due 24 29
Consumer Loans To Individuals [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past Due $ 0 $ 0