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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
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance, $ 6,463 $ 7,298 $ 5,875
Charge Offs (1,220) (2,951) (3,198)
Recoveries 191 66 41
Provision for loan losses 2,200 2,050 4,580
Ending balance, 7,634 6,463 7,298
Ending balance individually evaluated for impairment   3 1,613
Ending balance collectively evaluated for impairment 7,634 6,460 5,685
Residential Real Estate Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance, 1,092 1,069 1,323
Charge Offs (83) (123) (224)
Recoveries 6 6 20
Provision for loan losses 257 140 (50)
Ending balance, 1,272 1,092 1,069
Ending balance individually evaluated for impairment 0 0  
Ending balance collectively evaluated for impairment 1,272 1,092 1,069
Commercial Real Estate Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance, 4,623 5,506 3,890
Charge Offs (902) (2,711) (2,883)
Recoveries 159 15  
Provision for loan losses 1,385 1,813 4,499
Ending balance, 5,265 4,623 5,506
Ending balance individually evaluated for impairment 0 3 1,613
Ending balance collectively evaluated for impairment 5,265 4,620 3,893
Construction Real Estate Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance, 78 90 222
Charge Offs (28) 0  
Recoveries 0 0  
Provision for loan losses 40 (12) (132)
Ending balance, 90 78 90
Ending balance individually evaluated for impairment 0 0  
Ending balance collectively evaluated for impairment 90 78 90
Commercial, Financial And Agricultural [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance, 307 397 256
Charge Offs 0 (15)  
Recoveries 0 0  
Provision for loan losses 156 (75) 141
Ending balance, 463 307 397
Ending balance individually evaluated for impairment 0 0  
Ending balance collectively evaluated for impairment 463 307 397
Consumer Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance, 363 236 184
Charge Offs (207) (102) (91)
Recoveries 26 45 21
Provision for loan losses 362 184 122
Ending balance, 544 363 236
Ending balance individually evaluated for impairment 0 0  
Ending balance collectively evaluated for impairment $ 544 $ 363 $ 236