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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 11,580 | $ 20,245 | $ 12,539 | $ 21,467
Interest income recognized on an accrual basis | 98 | 122 | 294 | 368
Interest income recognized on a cash basis | 2 | 1 | 131 | 8
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 772 | 6,144 | 1,716 | 6,255
Interest income recognized on an accrual basis | 2 | 6 | 9 | 18
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 | 5,848 | 7,308 | 5,495 | 8,314
Interest income recognized on an accrual basis | 54 | 52 | 153 | 157
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 | 422 | 582 | 475 | 582
Interest income recognized on an accrual basis | 6 | 6 | 18 | 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 | 274 | 1,812 | 350 | 1,851
Interest income recognized on an accrual basis | 3 | 23 | 9 | 68
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 161 | 496 | 327 | 393
Interest income recognized on an accrual basis | 3 | 3 | 13 | 9
Interest income recognized on a cash basis | 0 | 0 | 0 | 0
Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 3,537 | 3,654 | 3,566 | 3,836
Interest income recognized on an accrual basis | 30 | 32 | 92 | 98
Interest income recognized on a cash basis | 2 | 1 | 2 | 8
Residential mortgage- home equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 544 | 249 | 585 | 236
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 | 22 | 0 | 25 | 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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