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Modification which Occurred During the Period & Change in Recorded Investment(Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 54 | 50 | 44
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 8,130 | $ 7,663 | $ 6,085
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Post-Modification Outstanding Recorded Investment | $ 8,175 | $ 7,705 | $ 6,112
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 6 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 153 |
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Post-Modification Outstanding Recorded Investment |  | $ 153 |
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 17 | 13 | 8
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 1,985 | $ 932 | $ 694
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Post-Modification Outstanding Recorded Investment | $ 1,988 | $ 932 | $ 694
Residential Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 10 | 8 | 8
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 1,284 | $ 1,808 | $ 843
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Post-Modification Outstanding Recorded Investment | $ 1,326 | $ 1,850 | $ 870
Small Business [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 9 | 3 | 9
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 369 | $ 188 | $ 293
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Post-Modification Outstanding Recorded Investment | $ 369 | $ 188 | $ 293
Commercial Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 6 | 10 | 6
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 2,705 | $ 2,959 | $ 2,941
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Post-Modification Outstanding Recorded Investment | $ 2,705 | $ 2,959 | $ 2,941
Commercial And Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 12 | 10 | 13
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ 1,787 | $ 1,623 | $ 1,314
TROUBLED DEBT RESTRUCTURINGS: |  |  |
Post-Modification Outstanding Recorded Investment | $ 1,787 | $ 1,623 | $ 1,314

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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