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Loans And Related Allowances For Loan Losses (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2021 USD ($) loan | Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2021 USD ($) contract loan | Sep. 30, 2020 USD ($) contract | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ 16,906,000 | $ 16,189,000 | $ 16,906,000 | $ 16,189,000 | $ 16,486,000 | $ 17,068,000 | $ 17,014,000 | $ 12,537,000
Nonaccrual loans |  | 7,441,000 |  | 7,441,000 |  | 3,339,000 |  |  |
Financing receivable, modifications, subsequent default, recorded investment |  |  |  | 0 | $ 0 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | loan | 11 |  |  |  |  |  |  |  |
Financing receivable, modifications, recorded investment | $ 9,900,000 |  |  |  |  |  |  |  |
Partial Charge Off [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | $ 500,000 |  | $ 500,000 |  | 400,000 |  |  |
New TDRs [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | contract |  | 0 | 0 | 0 | 0 |  |  |  |
Existing TDRs [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | contract |  | 2 | 2 | 3 | 9 |  |  |  |
Troubled Debt Restructuring [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | loan |  |  |  | 14 |  |  |  |  |
Financing receivable, modifications, recorded investment |  | $ 3,800,000 |  | $ 3,800,000 |  | 4,000,000.0 |  |  |
Additional funds |  | 0 |  | 0 |  |  |  |  |
Financing receivable, modifications, subsequent default, recorded investment |  |  | $ 0 |  |  |  |  |  |
Commercial real estate- non owner-occupied [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | 4,470,000 |  | 4,470,000 |  | 8,000 |  |  |
Commercial real estate- all other CRE [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | 547,000 |  | 547,000 |  | 890,000 |  |  |
Acquisition and development- 1-4 family residential construction [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Loans in process of foreclosure |  | 200,000 |  | $ 200,000 |  | $ 400,000 |  |  |
Percentage of loan portfolio accruing loans including PPP loans past due 30 days or more |  |  |  | 0.20% |  |  |  |  |
Percentage of loan portfolio accruing loans excluding PPP loans past due 30 days or more |  |  |  | 0.21% |  | 0.20% |  |  |
Acquisition and development- All other A&D [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | 395,000 |  | $ 395,000 |  | $ 366,000 |  |  |
Commercial and industrial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
PPP loans |  |  |  |  |  | 114,000,000.0 |  |  |
Allowance for loan losses |  | 2,400,000 | 2,184,000 | 2,400,000 | $ 2,184,000 | 2,584,000 | 2,944,000 | 1,997,000 | 1,341,000
Commercial and industrial [Member] | CARES Act [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
PPP loans |  | 30,300,000 |  | $ 30,300,000 |  | $ 114,000,000.0 |  |  |
PPP loans SBA guarantee percent |  |  |  | 100.00% |  | 100.00% |  |  |
Allowance for loan losses |  | 0 |  | $ 0 |  | $ 0 |  |  |
Residential mortgage- term [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | 1,580,000 |  | 1,580,000 |  | 1,634,000 |  |  |
Residential mortgage- home equity [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | 431,000 |  | 431,000 |  | 414,000 |  |  |
Consumer [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 842,000 | $ 381,000 | 842,000 | $ 381,000 | 370,000 | $ 590,000 | $ 386,000 | $ 312,000
Nonaccrual loans |  | $ 18,000 |  | $ 18,000 |  | $ 27,000 |  |  |

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