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Loans and Related Allowance for Loan Losses (Average of Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 22,691 | $ 25,147
Interest income recognized on an accrual basis | 124 | 123
Interest income recognized on a cash basis | 0 | 4
Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 6,366 | 1,597
Interest income recognized on an accrual basis | 6 | 6
Interest income recognized on a cash basis | 0 | 0
Commercial real estate- all other CRE [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 9,320 | 13,093
Interest income recognized on an accrual basis | 53 | 37
Interest income recognized on a cash basis | 0 | 0
Acquisition and development- 1-4 family residential construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 582 | 700
Interest income recognized on an accrual basis | 6 | 8
Interest income recognized on a cash basis | 0 | 0
Acquisition and development- All other A&D [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 1,891 | 3,869
Interest income recognized on an accrual basis | 23 | 24
Interest income recognized on a cash basis | 0 | 0
Commercial and industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 290 | 1,071
Interest income recognized on an accrual basis | 3 | 9
Interest income recognized on a cash basis | 0 | 0
Residential mortgage- term [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 4,018 | 4,519
Interest income recognized on an accrual basis | 33 | 39
Interest income recognized on a cash basis | 0 | 4
Residential mortgage- home equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 224 | 298
Interest income recognized on an accrual basis | 0 | 0
Interest income recognized on a cash basis | 0 | 0
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 0 | 0
Interest income recognized on an accrual basis | 0 | 0
Interest income recognized on a cash basis | $ 0 | $ 0

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