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Loans And Related Allowances For Loan Losses (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) loan contract | Dec. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Commercial amount benchmark minimum for internal annual review | $ 500,000 |
Commercial amount benchmark minimum for annual review by independent reviewer | 1,000,000 |
Commercial relationship amount benchmark for evaluation | 750,000 |
Nonaccrual loans subject to partial charge off | $ 13,946,000 | $ 15,498,000
Financing receivable, modifications, number of contracts | loan | 24 | 29
Financing receivable, modifications, recorded investment | $ 9,300,000 | $ 14,000,000
Transfers from loans to OREO | 6,938,000 | 1,385,000
Partial Charge Off [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | $ 11,100,000 | 4,100,000
New TDR [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing receivable, modifications, number of contracts | contract | 7 |
Reduction of the ALL resulting from new TDRs | $ 7,000 |
Pre-Existing Troubled Debt Restructuring Loans Remodified After Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing receivable, modifications, number of contracts | contract | 5 |
Troubled Debt Restructuring [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Unused commitments to extend credit | $ 0 | 11,200
Foreclosure 1-4 Family Real Estate Properties [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loans secured by real estate properties in process of foreclosure | 500,000 | 1,800,000
Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | 6,381,000 | 1,308,000
Commercial real estate- all other CRE [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | 5,830,000 | 9,974,000
Transfers from loans to OREO | 1,500,000 |
Acquisition and development- 1-4 family residential construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | 0 | 0
Acquisition and development- All other A&D [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | 45,000 | 1,817,000
Transfers from loans to OREO | 1,700,000 |
Commercial and industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | 0 | 185,000
Transfers from loans to OREO | 200,000 |
Residential mortgage- term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | $ 1,539,000 | 1,938,000
Financing receivable, modifications, subsequent default, number of contracts | loan | 2 |
Financing receivable, modifications, subsequent default, recorded investment | $ 100,000 | 200,000
Transfers from loans to OREO | 200,000 | 100,000
Residential mortgage- home equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | 151,000 | 276,000
Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual loans subject to partial charge off | $ 0 | $ 0

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