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Loans Receivable and Allowance for Loan Losses (Allowance for Loan Losses and Recorded Investment in Financing Receivables) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period $ 7,419 $ 5,798 $ 6,463 $ 7,298
Charge Offs (272) (99) (546) (2,788)
Recoveries 13 15 43 54
Provision for loan losses 600 450 1,800 1,600
Allowance at end of period 7,760 6,164 7,760 6,164
Ending balance individually evaluated for impairment   15   15
Ending balance collectively evaluated for impairment 7,760 6,149 7,760 6,149
Residential Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 1,254 976 1,092 1,069
Charge Offs   (15) (83) (32)
Recoveries 1 2 4 4
Provision for loan losses 98 93 340 15
Allowance at end of period 1,353 1,056 1,353 1,056
Ending balance collectively evaluated for impairment 1,353 1,056 1,353 1,056
Commercial Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 5,228 4,191 4,623 5,506
Charge Offs (212) (28) (308) (2,670)
Recoveries 1 9 5 11
Provision for loan losses 282 191 979 1,516
Allowance at end of period 5,299 4,363 5,299 4,363
Ending balance individually evaluated for impairment   15   15
Ending balance collectively evaluated for impairment 5,299 4,348 5,299 4,348
Construction Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 93 59 78 90
Charge Offs (15)   (28)  
Recoveries     12  
Provision for loan losses 19 19 35 (12)
Allowance at end of period 97 78 97 78
Ending balance collectively evaluated for impairment 97 78 97 78
Commercial, Financial And Agricultural [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 360 293 307 397
Charge Offs   (15)   (15)
Provision for loan losses 112 58 165 (46)
Allowance at end of period 472 336 472 336
Ending balance collectively evaluated for impairment 472 336 472 336
Consumer Loans To Individuals [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 484 279 363 236
Charge Offs (45) (41) (127) (71)
Recoveries 11 4 22 39
Provision for loan losses 89 89 281 127
Allowance at end of period 539 331 539 331
Ending balance collectively evaluated for impairment $ 539 $ 331 $ 539 $ 331