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Fair Value Measurements (Impaired Loans And Other Real Estate Owned Measured At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired loans | [1] | $ 2,523 | $ 2,830 |
Loans held for sale |  | 1,502 | 3,833 |
Other real estate owned |  | 2,639 | 2,370 | $ 1,965
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans held for sale |  | 0 |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired loans | [1] |  |  |
Loans held for sale |  |  |  |
Other real estate owned |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans held for sale |  | 1,502 | 3,833 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired loans | [1] | 2,523 | 2,830 |
Loans held for sale |  |  |  |
Other real estate owned |  | $ 2,639 | $ 2,370 |
[1] | Includes loans charged down to the net realizable value of the collateral.

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