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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, 2019 | Mar. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 13,468 | $ 13,498
Interest income recognized on an accrual basis | 77 | 99
Interest income recognized on a cash basis | 8 | 129
Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 280 | 2,660
Interest income recognized on an accrual basis | 3 | 4
Interest income recognized on a cash basis | 0 | 66
Commercial real estate- all other CRE [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 4,516 | 5,142
Interest income recognized on an accrual basis | 38 | 49
Interest income recognized on a cash basis | 0 | 56
Acquisition and development- 1-4 family residential construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 313 | 527
Interest income recognized on an accrual basis | 5 | 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 | 4,040 | 426
Interest income recognized on an accrual basis | 3 | 3
Interest income recognized on a cash basis | 0 | 0
Commercial and industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 22 | 493
Interest income recognized on an accrual basis | 0 | 5
Interest income recognized on a cash basis | 0 | 0
Residential mortgage- term [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 3,462 | 3,595
Interest income recognized on an accrual basis | 28 | 32
Interest income recognized on a cash basis | 8 | 0
Residential mortgage- home equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 818 | 627
Interest income recognized on an accrual basis | 0 | 0
Interest income recognized on a cash basis | 0 | 7
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 17 | 28
Interest income recognized on an accrual basis | 0 | 0
Interest income recognized on a cash basis | $ 0 | $ 0

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