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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 13,498 | $ 22,691
Interest income recognized on an accrual basis | 99 | 124
Interest income recognized on a cash basis | 129 | 0
Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 2,660 | 6,366
Interest income recognized on an accrual basis | 4 | 6
Interest income recognized on a cash basis | 66 | 0
Commercial real estate- all other CRE [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 5,142 | 9,320
Interest income recognized on an accrual basis | 49 | 53
Interest income recognized on a cash basis | 56 | 0
Acquisition and development- 1-4 family residential construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 527 | 582
Interest income recognized on an accrual basis | 6 | 6
Interest income recognized on a cash basis | 0 | 0
Acquisition and development- All other A&D [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 426 | 1,891
Interest income recognized on an accrual basis | 3 | 23
Interest income recognized on a cash basis | 0 | 0
Commercial and industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 493 | 290
Interest income recognized on an accrual basis | 5 | 3
Interest income recognized on a cash basis | 0 | 0
Residential mortgage- term [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 3,595 | 4,018
Interest income recognized on an accrual basis | 32 | 33
Interest income recognized on a cash basis | 0 | 0
Residential mortgage- home equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 627 | 224
Interest income recognized on an accrual basis | 0 | 0
Interest income recognized on a cash basis | 7 | 0
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 28 | 0
Interest income recognized on an accrual basis | 0 | 0
Interest income recognized on a cash basis | $ 0 | $ 0

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