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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance, | $ 7,634 | $ 6,463
Charge Offs | (99) | (184)
Recoveries | 14 | 22
Provision for loan losses | 550 | 600
Ending balance, | 8,099 | 6,901
Ending balance collectively evaluated for impairment | 8,099 | 6,901
Residential Real Estate Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance, | 1,272 | 1,092
Charge Offs | (51) | (39)
Recoveries | 1 | 1
Provision for loan losses | 303 | 125
Ending balance, | 1,525 | 1,179
Ending balance collectively evaluated for impairment | 1,525 | 1,179
Commercial Real Estate Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance, | 5,265 | 4,623
Charge Offs |  | (85)
Recoveries | 6 | 2
Provision for loan losses | (142) | 291
Ending balance, | 5,129 | 4,831
Ending balance collectively evaluated for impairment | 5,129 | 4,831
Construction Real Estate Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance, | 90 | 78
Charge Offs |  | (8)
Recoveries |  | 12
Provision for loan losses | 30 | 13
Ending balance, | 120 | 95
Ending balance collectively evaluated for impairment | 120 | 95
Commercial, Financial And Agricultural [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance, | 463 | 307
Provision for loan losses | 175 | 62
Ending balance, | 638 | 369
Ending balance collectively evaluated for impairment | 638 | 369
Consumer Loans To Individuals [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning balance, | 544 | 363
Charge Offs | (48) | (52)
Recoveries | 7 | 7
Provision for loan losses | 184 | 109
Ending balance, | 687 | 427
Ending balance collectively evaluated for impairment | $ 687 | $ 427

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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=84173941&loc=SL6953423-111524 + Details
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Period Type: | instant

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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=84173941&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=84173941&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=84173941&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=84173941&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=98514028&loc=d3e3602-108585 + Details
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