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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 16,874 | $ 11,580 | $ 15,171 | $ 12,539
Interest income recognized on an accrual basis | 69 | 98 | 219 | 294
Interest income recognized on a cash basis | 70 | 2 | 82 | 131
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 201 | 772 | 241 | 1,716
Interest income recognized on an accrual basis | 3 | 2 | 9 | 9
Interest income recognized on a cash basis |  |  |  | 66
Commercial real estate- all other CRE [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 4,773 | 5,848 | 4,644 | 5,495
Interest income recognized on an accrual basis | 37 | 54 | 113 | 153
Interest income recognized on a cash basis | 68 |  | 68 | 56
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 152 | 422 | 232 | 475
Interest income recognized on an accrual basis | 1 | 6 | 10 | 18
Acquisition and development- All other A&D [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 8,085 | 274 | 6,062 | 350
Interest income recognized on an accrual basis | 6 | 3 | 12 | 9
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 27 | 161 | 25 | 327
Interest income recognized on an accrual basis |  | 3 |  | 13
Residential mortgage- term [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 2,701 | 3,537 | 3,082 | 3,566
Interest income recognized on an accrual basis | 22 | 30 | 75 | 92
Interest income recognized on a cash basis |  | 2 | 10 | 2
Residential mortgage- home equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | 928 | 544 | 873 | 585
Interest income recognized on a cash basis | 2 |  | 4 | 7
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Investment | $ 7 | $ 22 | $ 12 | $ 25

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