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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
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 2,624 | $ 2,855 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  | 6,373 |
Impaired Financing Receivable, Recorded Investment | 2,624 | 9,228 |
Unpaid Principal Balance, With no related allowance recorded | 3,455 | 4,826 |
Unpaid Principal Balance, With an allowance recorded |  | 6,446 |
Unpaid Principal Balance, Total | 3,455 | 11,272 |
Associated Allowance |  | 1,613 |
Average Recorded Investment, Total | 2,696 | 9,015 | $ 7,725
Interest Income Recognized, Total | 91 | 532 | 508
Commercial, financial and agricultural loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  | 43 |
Impaired Financing Receivable, Recorded Investment |  | 43 |
Unpaid Principal Balance, With no related allowance recorded |  | 43 |
Unpaid Principal Balance, Total |  | 43 |
Average Recorded Investment, Total |  | 9 | 0
Interest Income Recognized, Total | 0 | 2 | 0
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 23 | 168 |
Impaired Financing Receivable, Recorded Investment | 23 | 168 |
Unpaid Principal Balance, With no related allowance recorded | 28 | 173 |
Unpaid Principal Balance, Total | 28 | 173 |
Associated Allowance | 0 | 0 |
Average Recorded Investment, Total | 25 | 159 | 233
Interest Income Recognized, Total | 0 | 4 | 5
Commercial Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,601 | 2,644 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  | 6,373 |
Impaired Financing Receivable, Recorded Investment | 2,601 | 9,017 |
Unpaid Principal Balance, With no related allowance recorded | 3,427 | 4,610 |
Unpaid Principal Balance, With an allowance recorded |  | 6,446 |
Unpaid Principal Balance, Total | 3,427 | 11,056 |
Associated Allowance |  | 1,613 |
Average Recorded Investment, Total | 2,671 | 8,847 | 7,492
Interest Income Recognized, Total | $ 91 | $ 526 | $ 503

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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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