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Loans And Related Allowances For Loan Losses (Average of Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 15,225 | $ 13,468
Interest income recognized on an accrual basis | 67 | 77
Interest income recognized on a cash basis | 1 | 8
Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 141 | 280
Interest income recognized on an accrual basis | 2 | 3
Commercial real estate- all other CRE [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 3,124 | 4,516
Interest income recognized on an accrual basis | 37 | 38
Acquisition and development- 1-4 family residential construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 288 | 313
Interest income recognized on an accrual basis | 3 | 5
All Other Acquisition And Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 8,328 | 4,040
Interest income recognized on an accrual basis | 3 | 3
Interest income recognized on a cash basis | 1 |
Commercial and industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 15 | 22
Residential mortgage- term [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 2,497 | 3,462
Interest income recognized on an accrual basis | 22 | 28
Interest income recognized on a cash basis |  | 8
Residential mortgage- home equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 828 | 818
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 4 | $ 17

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