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Troubled Debt Restructurings (Loans By Class Of Financing Receivable Modified As TDRs) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 contract | Sep. 30, 2016 USD ($) contract | Dec. 31, 2016 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |  |
Number of Contracts | 20 |  | 26
Troubled Debt Restructurings Within Previous Twelve Months [Member] |  |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |  |
Number of Contracts |  | 1 |
Recorded Investment | $ |  | $ 74 |
Residential Single Family | Troubled Debt Restructurings Within Previous Twelve Months [Member] |  |  |
Troubled Debt Restructuring, Subsequent Periods [Line Items] |  |  |
Number of Contracts |  | 1 |
Recorded Investment | $ |  | $ 74 |

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- Definition Troubled Debt Restructuring, Subsequent Periods [Line Items] + References No definition available. + Details
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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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