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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | $ 11,229 | $ 14,929 | $ 10,465 | $ 15,076 | $ 13,554
Interest income recognized on an accrual basis | 52 | 64 | 178 | 195 |
Interest income recognized on a cash basis |  |  | 5 | 4 |
Commercial real estate- non owner-occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | 4,631 | 127 | 3,518 | 134 | 131
Interest income recognized on an accrual basis | 3 | 3 | 9 | 6 |
Commercial real estate- all other CRE [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | 2,787 | 3,278 | 2,984 | 3,201 | 3,203
Interest income recognized on an accrual basis | 26 | 36 | 95 | 109 |
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | 249 | 276 | 256 | 282 | 278
Interest income recognized on an accrual basis | 3 | 3 | 9 | 9 |
Acquisition and development- All other A&D [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | 602 | 8,158 | 599 | 8,243 | 6,709
Interest income recognized on an accrual basis | 3 | 3 | 9 | 9 |
Interest income recognized on a cash basis |  |  |  | 1 |
Commercial and industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment |  | 18 |  | 16 | 16
Residential mortgage- term [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | 2,500 | 2,565 | 2,642 | 2,531 | 2,593
Interest income recognized on an accrual basis | 17 | 19 | 56 | 62 |
Interest income recognized on a cash basis |  |  | 5 |  |
Residential mortgage- home equity [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | 451 | 474 | 449 | 651 | 604
Interest income recognized on a cash basis |  |  |  | 3 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Investment | $ 9 | $ 33 | $ 17 | $ 18 | $ 20

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