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Loans Receivable and Allowance for Loan Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 1,247 | $ 2,624 |
Impaired Financing Receivable, Recorded Investment | 1,247 | 2,624 |
Unpaid Principal Balance, With no related allowance recorded | 1,524 | 3,455 |
Unpaid Principal Balance, Total | 1,524 | 3,455 |
Average Recorded Investment, Total | 1,232 | 2,696 | $ 9,015
Interest Income Recognized, Total | 56 | 91 | 532
Commercial, Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment, Total |  |  | 9
Interest Income Recognized, Total |  |  | 2
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 23 | 23 |
Impaired Financing Receivable, Recorded Investment | 23 | 23 |
Unpaid Principal Balance, With no related allowance recorded | 28 | 28 |
Unpaid Principal Balance, Total | 28 | 28 |
Associated Allowance | 0 | 0 |
Average Recorded Investment, Total | 23 | 25 | 159
Interest Income Recognized, Total | 0 | 0 | 4
Commercial Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,224 | 2,601 |
Impaired Financing Receivable, Recorded Investment | 1,224 | 2,601 |
Unpaid Principal Balance, With no related allowance recorded | 1,496 | 3,427 |
Unpaid Principal Balance, Total | 1,496 | 3,427 |
Average Recorded Investment, Total | 1,209 | 2,671 | 8,847
Interest Income Recognized, Total | $ 56 | $ 91 | $ 526

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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