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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 28,467 | $ 23,724 | $ 27,248 | $ 24,077
Interest income recognized on an accrual basis | 164 | 172 | 287 | 343
Interest income recognized on a cash basis | 4 | 29 | 8 | 30
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 5,916 | 4,088 | 4,513 | 4,224
Interest income recognized on an accrual basis | 41 | 38 | 47 | 78
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 | 12,568 | 7,574 | 12,692 | 7,533
Interest income recognized on an accrual basis | 43 | 28 | 80 | 55
Interest income recognized on a cash basis | 4 | 7 | 4 | 8
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 641 | 746 | 661 | 760
Interest income recognized on an accrual basis | 7 | 9 | 15 | 18
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 | 2,988 | 5,245 | 3,257 | 5,417
Interest income recognized on an accrual basis | 24 | 31 | 48 | 63
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 1,121 | 1,495 | 1,106 | 1,617
Interest income recognized on an accrual basis | 10 | 24 | 19 | 47
Interest income recognized on a cash basis | 0 | 18 | 0 | 18
Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 4,885 | 4,181 | 4,695 | 4,146
Interest income recognized on an accrual basis | 39 | 42 | 78 | 82
Interest income recognized on a cash basis | 0 | 2 | 4 | 2
Residential mortgage- home equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 348 | 388 | 324 | 373
Interest income recognized on an accrual basis | 0 | 0 | 0 | 0
Interest income recognized on a cash basis | 0 | 2 | 0 | 2
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 0 | 7 | 0 | 7
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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