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Loans And Related Allowances For Loan Losses (Narrative) (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 06, 2020 USD ($) contract | Jun. 30, 2020 USD ($) contract | Jun. 30, 2019 USD ($) contract | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) contract loan | Jun. 30, 2019 USD ($) contract | Dec. 31, 2019 USD ($) contract | Mar. 31, 2020 USD ($) | Dec. 31, 2018 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ 17,014,000 | $ 11,976,000 | $ 11,548,000 | $ 17,014,000 | $ 11,976,000 | $ 12,537,000 | $ 15,012,000 | $ 11,047,000
Nonaccrual loans |  | 11,081,000 | 2,300,000 |  | $ 11,081,000 | $ 2,300,000 | 10,849,000 |  |
Percentage of loan portfolio accruing loans past due 30 days or more |  |  |  |  | 0.19% | 0.46% |  |  |
Financing receivable, modifications, number of contracts | contract |  |  |  |  | 10,811 | 2 |  |  |
Financing receivable, modifications, recorded investment |  | 1,042,514,000 | $ 470,000 |  | $ 1,042,514,000 | $ 470,000 |  |  |
Substandard [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Increase in non-accrual status |  |  |  |  | $ 14,400,000 |  |  |  |
Number of well collateralized loans that increased balance of substandard category | loan |  |  |  |  | 2 |  |  |  |
COVID-19 [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
PPP loans |  | 144,400,000 |  |  | $ 144,400,000 |  |  |  |
Percentage of loan portfolio accruing loans including PPP loans past due 30 days or more |  |  |  |  | 0.17% |  |  |  |
Financing receivable, modifications, number of contracts | contract | 508 |  |  |  |  |  |  |  |
Financing receivable, modifications, recorded investment | $ 161,225,000 |  |  |  |  |  |  |  |
CARES Act [Member] | COVID-19 [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
PPP loans SBA guarantee percent |  |  |  |  | 100.00% |  |  |  |
Partial Charge Off [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | $ 200,000 |  |  | $ 200,000 |  | $ 200,000 |  |
New TDRs [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | contract |  | 0 | 0 |  | 0 |  |  |  |
Existing TDRs [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | contract |  | 6 | 0 |  | 6 |  | 15 |  |
Financing receivable, modifications, subsequent default, recorded investment |  | $ 0 | $ 0 |  | $ 0 |  |  |  |
Existing TDRs loans Remodified After Maturity [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | contract |  |  |  |  | 14 |  |  |  |
Financing receivable, modifications, recorded investment |  | 4,000,000.0 |  |  | $ 4,000,000.0 |  | $ 4,200,000 |  |
Foreclosure 1-4 Family Real Estate Properties [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Loans secured by real estate properties in process of foreclosure |  | 200,000 |  |  | 200,000 |  | 100,000 |  |
Commercial real estate- non owner-occupied [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | 17,000 |  |  | 17,000 |  | 33,000 |  |
Commercial real estate- all other CRE [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Increase in non-accrual status |  |  |  |  | 200,000 |  |  |  |
Nonaccrual loans |  | 956,000 |  |  | $ 956,000 |  | 647,000 |  |
Number of loan resulted in increase in non-accrual balances | loan |  |  |  |  | 1 |  |  |  |
Acquisition and development- All other A&D [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Increase in non-accrual status |  |  |  | 8,200,000 |  |  |  |  |
Nonaccrual loans |  | 8,439,000 |  |  | $ 8,439,000 |  | 8,058,000 |  |
Financing receivable, modifications, number of contracts | contract |  |  |  |  |  | 1 |  |  |
Financing receivable, modifications, recorded investment |  |  | 227,000 |  |  | $ 227,000 |  |  |
Commercial and industrial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 1,997,000 | 1,147,000 | 1,125,000 | 1,997,000 | $ 1,147,000 | 1,341,000 | 1,682,000 | 1,187,000
Nonaccrual loans |  | 18,000 |  |  | 18,000 |  | 30,000 |  |
Commercial and industrial [Member] | CARES Act [Member] | COVID-19 [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
PPP loans |  | 144,400,000 |  |  | $ 144,400,000 |  |  |  |
PPP loans SBA guarantee percent |  |  |  |  | 100.00% |  |  |  |
Allowance for loan losses |  | 0 |  |  | $ 0 |  |  |  |
Residential mortgage- term [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Increase in non-accrual status |  |  |  |  | 1,500,000 |  |  |  |
Nonaccrual loans |  | 1,190,000 |  |  | $ 1,190,000 |  | 1,219,000 |  |
Number of loan resulted in increase in non-accrual balances | loan |  |  |  |  | 1 |  |  |  |
Financing receivable, modifications, number of contracts | contract |  |  |  |  |  | 1 |  |  |
Financing receivable, modifications, recorded investment |  |  | 243,000 |  |  | $ 243,000 |  |  |
Residential mortgage- home equity [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans |  | 427,000 |  |  | $ 427,000 |  | 858,000 |  |
Consumer [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 386,000 | $ 319,000 | $ 313,000 | 386,000 | $ 319,000 | 312,000 | $ 365,000 | $ 315,000
Nonaccrual loans |  | $ 34,000 |  |  | $ 34,000 |  | $ 4,000 |  |

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