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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 20,257 | $ 28,467 | $ 21,575 | $ 27,248
Interest income recognized on an accrual basis | 122 | 164 | 246 | 287
Interest income recognized on a cash basis | 7 | 4 | 7 | 8
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 5,672 | 5,916 | 6,037 | 4,513
Interest income recognized on an accrual basis | 6 | 41 | 12 | 47
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 | 7,766 | 12,568 | 8,658 | 12,692
Interest income recognized on an accrual basis | 52 | 43 | 105 | 80
Interest income recognized on a cash basis | 0 | 4 | 0 | 4
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 582 | 641 | 582 | 661
Interest income recognized on an accrual basis | 6 | 7 | 12 | 15
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 | 1,818 | 2,988 | 1,860 | 3,257
Interest income recognized on an accrual basis | 22 | 24 | 45 | 48
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 290 | 1,121 | 290 | 1,106
Interest income recognized on an accrual basis | 3 | 10 | 6 | 19
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 3,860 | 4,885 | 3,918 | 4,695
Interest income recognized on an accrual basis | 33 | 39 | 66 | 78
Interest income recognized on a cash basis | 7 | 0 | 7 | 4
Residential mortgage- home equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 269 | 348 | 230 | 324
Interest income recognized on an accrual basis | 0 | 0 | 0 | 0
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 0 | 0 | 0 | 0
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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