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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
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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

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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