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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 23,724 | $ 29,838 | $ 24,077 | $ 30,998
Interest income recognized on an accrual basis | 172 | 167 | 343 | 373
Interest income recognized on a cash basis | 29 | 86 | 30 | 99
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 4,088 | 1,068 | 4,224 | 1,105
Interest income recognized on an accrual basis | 38 | 4 | 78 | 11
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Commercial real estate- all other CRE [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 7,574 | 9,624 | 7,533 | 9,936
Interest income recognized on an accrual basis | 28 | 40 | 55 | 81
Interest income recognized on a cash basis | 7 | 43 | 8 | 44
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 746 | 1,549 | 760 | 1,919
Interest income recognized on an accrual basis | 9 | 11 | 18 | 25
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Acquisition and development- All other A&D [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 5,245 | 8,329 | 5,417 | 8,567
Interest income recognized on an accrual basis | 31 | 35 | 63 | 96
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 1,495 | 2,040 | 1,617 | 2,126
Interest income recognized on an accrual basis | 24 | 23 | 47 | 49
Interest income recognized on a cash basis | 18 | 0 | 18 | 2
Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 4,181 | 6,489 | 4,146 | 6,648
Interest income recognized on an accrual basis | 42 | 53 | 82 | 107
Interest income recognized on a cash basis | 2 | 43 | 2 | 52
Residential mortgage- home equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 388 | 739 | 373 | 686
Interest income recognized on an accrual basis | 0 | 1 | 0 | 4
Interest income recognized on a cash basis | 2 | 0 | 2 | 1
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 7 | 0 | 7 | 11
Interest income recognized on an accrual basis | 0 | 0 | 0 | 0
Interest income recognized on a cash basis | $ 0 | $ 0 | $ 0 | $ 0

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