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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 | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 13,554 | $ 15,170
Interest income recognized on an accrual basis | 259 | 287
Interest income recognized on a cash basis | 5 | 87
Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 131 | 222
Interest income recognized on an accrual basis | 9 | 12
Commercial real estate- all other CRE [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 3,203 | 4,322
Interest income recognized on an accrual basis | 144 | 149
Interest income recognized on a cash basis |  | 73
Acquisition and development- 1-4 family residential construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 278 | 244
Interest income recognized on an accrual basis | 12 | 11
Acquisition and development- All other A&D [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 6,709 | 6,505
Interest income recognized on an accrual basis | 12 | 19
Interest income recognized on a cash basis | 1 |
Commercial and industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 16 | 26
Residential mortgage- term [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 2,593 | 2,971
Interest income recognized on an accrual basis | 82 | 96
Interest income recognized on a cash basis |  | 10
Residential mortgage- home equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | 604 | 870
Interest income recognized on a cash basis | 4 | 4
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Investment | $ 20 | $ 10

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