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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 17,053 | $ 12,294 | $ 14,892 | $ 12,539
Interest income recognized on an accrual basis | 73 | 97 | 150 | 196
Interest income recognized on a cash basis | 4 |  | 12 | 129
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 258 | 1,258 | 270 | 813
Interest income recognized on an accrual basis | 3 | 3 | 6 | 7
Interest income recognized on a cash basis |  |  |  | 66
Commercial real estate- all other CRE [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 4,807 | 5,726 | 4,853 | 6,625
Interest income recognized on an accrual basis | 38 | 50 | 76 | 99
Interest income recognized on a cash basis |  |  |  | 56
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 307 | 492 | 310 | 457
Interest income recognized on an accrual basis | 4 | 6 | 9 | 12
Acquisition and development- All other A&D [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 7,772 | 340 | 5,306 | 276
Interest income recognized on an accrual basis | 3 | 3 | 6 | 6
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 27 | 311 | 24 | 305
Interest income recognized on an accrual basis |  | 5 |  | 10
Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 2,941 | 3,529 | 3,261 | 3,487
Interest income recognized on an accrual basis | 25 | 30 | 53 | 62
Interest income recognized on a cash basis | 2 |  | 10 |
Residential mortgage- home equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 925 | 614 | 854 | 553
Interest income recognized on a cash basis | 2 |  | 2 | 7
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 16 | $ 24 | $ 14 | $ 23

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