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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, 2016 | Mar. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 25,147 | $ 23,828
Interest income recognized on an accrual basis | 123 | 171
Interest income recognized on a cash basis | 4 | 1
Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 1,597 | 4,022
Interest income recognized on an accrual basis | 6 | 40
Interest income recognized on a cash basis | 0 | 0
Commercial real estate- all other CRE [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 13,093 | 7,316
Interest income recognized on an accrual basis | 37 | 27
Interest income recognized on a cash basis | 0 | 1
Acquisition and development- 1-4 family residential construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 700 | 790
Interest income recognized on an accrual basis | 8 | 9
Interest income recognized on a cash basis | 0 | 0
All Other Acquisition and Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 3,869 | 5,530
Interest income recognized on an accrual basis | 24 | 32
Interest income recognized on a cash basis | 0 | 0
Commercial and industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 1,071 | 1,689
Interest income recognized on an accrual basis | 9 | 23
Interest income recognized on a cash basis | 0 | 0
Residential mortgage- term [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 4,519 | 4,091
Interest income recognized on an accrual basis | 39 | 40
Interest income recognized on a cash basis | 4 | 0
Residential mortgage- home equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 298 | 377
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 | 13
Interest income recognized on an accrual basis | 0 | 0
Interest income recognized on a cash basis | $ 0 | $ 0

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