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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 12,294 | $ 20,257 | $ 12,539 | $ 21,575
Interest income recognized on an accrual basis | 97 | 122 | 196 | 246
Interest income recognized on a cash basis | 0 | 7 | 129 | 7
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 1,258 | 5,672 | 813 | 6,037
Interest income recognized on an accrual basis | 3 | 6 | 7 | 12
Interest income recognized on a cash basis | 0 | 0 | 66 | 0
Commercial real estate- all other CRE [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 5,726 | 7,766 | 6,625 | 8,658
Interest income recognized on an accrual basis | 50 | 52 | 99 | 105
Interest income recognized on a cash basis | 0 | 0 | 56 | 0
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 492 | 582 | 457 | 582
Interest income recognized on an accrual basis | 6 | 6 | 12 | 12
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 | 340 | 1,818 | 276 | 1,860
Interest income recognized on an accrual basis | 3 | 22 | 6 | 45
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 311 | 290 | 305 | 290
Interest income recognized on an accrual basis | 5 | 3 | 10 | 6
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 3,529 | 3,860 | 3,487 | 3,918
Interest income recognized on an accrual basis | 30 | 33 | 62 | 66
Interest income recognized on a cash basis | 0 | 7 | 0 | 7
Residential mortgage- home equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 614 | 269 | 553 | 230
Interest income recognized on an accrual basis | 0 | 0 | 0 | 0
Interest income recognized on a cash basis | 0 | 0 | 7 | 0
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 24 | 0 | 23 | 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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