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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period $ 6,901 $ 7,642 $ 6,463 $ 7,298
Charge Offs (90) (2,553) (274) (2,689)
Recoveries 8 9 30 39
Provision for loan losses 600 700 1,200 1,150
Allowance at end of period 7,419 5,798 7,419 5,798
Ending balance individually evaluated for impairment   15   15
Ending balance collectively evaluated for impairment 7,419 5,783 7,419 5,783
Residential Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 1,179 1,077 1,092 1,069
Charge Offs (44) (17) (83) (17)
Recoveries 2 1 3 2
Provision for loan losses 117 (85) 242 (78)
Allowance at end of period 1,254 976 1,254 976
Ending balance collectively evaluated for impairment 1,254 976 1,254 976
Commercial Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 4,831 5,758 4,623 5,506
Charge Offs (11) (2,513) (96) (2,642)
Recoveries 2   4 2
Provision for loan losses 406 946 697 1,325
Allowance at end of period 5,228 4,191 5,228 4,191
Ending balance individually evaluated for impairment   15   15
Ending balance collectively evaluated for impairment 5,228 4,176 5,228 4,176
Construction Real Estate Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 95 109 78 90
Charge Offs (5)   (13)  
Recoveries     12  
Provision for loan losses 3 (50) 16 (31)
Allowance at end of period 93 59 93 59
Ending balance collectively evaluated for impairment 93 59 93 59
Commercial, financial and agricultural loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 369 446 307 397
Provision for loan losses (9) (153) 53 (104)
Allowance at end of period 360 293 360 293
Ending balance collectively evaluated for impairment 360 293 360 293
Consumer loans to individuals [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance at beginning of period 427 252 363 236
Charge Offs (30) (23) (82) (30)
Recoveries 4 8 11 35
Provision for loan losses 83 42 192 38
Allowance at end of period 484 279 484 279
Ending balance collectively evaluated for impairment $ 484 $ 279 $ 484 $ 279