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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period $ 5,798 $ 5,947 $ 7,298 $ 5,875
Charge Offs (99) (927) (2,788) (1,910)
Recoveries 15 7 54 22
Provision for loan losses 450 720 1,600 1,760
Allowance at end of period 6,164 5,747 6,164 5,747
Ending balance individually evaluated for impairment 15 389 15 389
Ending balance collectively evaluated for impairment 6,149 5,358 6,149 5,358
Residential Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 976 1,085 1,069 1,323
Charge Offs (15) (46) (32) (159)
Recoveries 2 0 4 4
Provision for loan losses 93 (52) 15 (181)
Allowance at end of period 1,056 987 1,056 987
Ending balance individually evaluated for impairment 0 0 0 0
Ending balance collectively evaluated for impairment 1,056 987 1,056 987
Commercial Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 4,191 4,152 5,506 3,890
Charge Offs (28) (865) (2,670) (1,692)
Recoveries 9 0 11 0
Provision for loan losses 191 891 1,516 1,980
Allowance at end of period 4,363 4,178 4,363 4,178
Ending balance individually evaluated for impairment 15 389 15 389
Ending balance collectively evaluated for impairment 4,348 3,789 4,348 3,789
Construction Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 59 97 90 222
Charge Offs 0 0 0 0
Recoveries 0 0 0 0
Provision for loan losses 19 (12) (12) (137)
Allowance at end of period 78 85 78 85
Ending balance individually evaluated for impairment 0 0 0 0
Ending balance collectively evaluated for impairment 78 85 78 85
Commercial, financial and agricultural loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 293 405 397 256
Charge Offs (15) 0 (15) 0
Recoveries 0 0 0 0
Provision for loan losses 58 (121) (46) 28
Allowance at end of period 336 284 336 284
Ending balance individually evaluated for impairment 0 0 0 0
Ending balance collectively evaluated for impairment 336 284 336 284
Consumer loans to individuals [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 279 208 236 184
Charge Offs (41) (16) (71) (59)
Recoveries 4 7 39 18
Provision for loan losses 89 14 127 70
Allowance at end of period 331 213 331 213
Ending balance individually evaluated for impairment 0 0 0 0
Ending balance collectively evaluated for impairment $ 331 $ 213 $ 331 $ 213