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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements For Certain Financial Assets) (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017
Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Quantitative information about level 3 nonrecurring basis | 12.00% | 7.00%
Fair Value Inputs, Discount Rate | 5.00% | 5.00%
Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Quantitative information about level 3 nonrecurring basis | 6.00% | 6.00%
Nonrecurring [Member] | Maximum [Member] | Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Quantitative information about level 3 nonrecurring basis | 12.00% | 12.00%
Fair Value Inputs, Discount Rate | 10.00% | 10.00%
Nonrecurring [Member] | Maximum [Member] | Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Quantitative information about level 3 nonrecurring basis | 6.00% | 6.00%
Nonrecurring [Member] | Minimum [Member] | Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Quantitative information about level 3 nonrecurring basis | 12.00% | 6.00%
Fair Value Inputs, Discount Rate | 4.00% | 4.00%
Nonrecurring [Member] | Minimum [Member] | Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Quantitative information about level 3 nonrecurring basis | 6.00% | 6.00%

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- Definition Quantitative Information Level Three Nonrecurring Basis Range + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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