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v3.21.1

Loans And Related Allowances For Loan Losses (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 USD ($) contract | Dec. 31, 2020 USD ($) loan | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) loan contract region | Dec. 31, 2019 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |
OREO increase (decrease) |  | $ 8,000,000.0 | $ 8,000,000.0 |  |
Nonaccrual loans |  | 3,339,000 |  | $ 3,339,000 | $ 10,849,000
Commercial amount benchmark minimum for internal annual review |  |  |  | 1,000,000 |
Commercial amount benchmark minimum for annual review by independent reviewer |  |  |  | 1,000,000 |
Non consumer loan amount benchmark minimum for annual review by independent reviewer |  |  |  | 750,000 |
Commercial relationship amount benchmark for evaluation |  |  |  | 750,000 |
Maximum commercial loan benchmark for external appraisal |  |  |  | $ 500,000 |
Past appraisal period benchmark for external appraisal |  |  |  | 18 months |
Threshold limit for commercial loan appraisal by internal discounted appraisal grid |  |  |  | $ 500,000 |
Financing receivable, modifications, number of contracts | contract |  |  |  | 10,891 |
Financing receivable, modifications, recorded investment |  | 1,053,821,000 |  | $ 1,053,821,000 |
Financing receivable, modifications, subsequent default, recorded investment |  |  |  | $ 0 |
Pass [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of geographic regions utilized | region |  |  |  | 7 |
Number of geographic regions that represent lending footprint | region |  |  |  | 6 |
COVID Modifications [Member] | Subsequent Event [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing receivable, modifications, number of contracts | contract | 40 |  |  |  |
Financing receivable, modifications, recorded investment | $ 18,240,000 |  |  |  |
Forbearance Granted [Member] | COVID-19 Pandemic [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of commercial accounts in forbearance | loan |  |  |  | 19 |
Amount of commercial accounts in forberance |  | 16,000,000.0 |  | $ 16,000,000.0 |
Forbearance Granted [Member] | COVID-19 Pandemic [Member] | Substandard [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Amount of commercial accounts in forberance |  | 4,600,000 |  | 4,600,000 |
Forbearance Granted [Member] | COVID-19 Pandemic [Member] | Special Mention [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Amount of commercial accounts in forberance |  | 12,300,000 |  | 12,300,000 |
Partial Charge Off [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  | 400,000 |  | $ 400,000 | $ 100,000
New TDRs [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing receivable, modifications, number of contracts | loan |  |  |  | 0 |
Existing TDRs loans Remodified After Maturity [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing receivable, modifications, number of contracts | loan |  |  |  | 9 |
Troubled Debt Restructuring [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing receivable, modifications, number of contracts | loan |  |  |  | 14 | 15
Financing receivable, modifications, recorded investment |  | 4,000,000.0 |  | $ 4,000,000.0 | $ 4,200,000
Unused commitments to extend credit |  | 0 |  | 0 | 0
Foreclosure 1-4 Family Real Estate Properties [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Loans secured by real estate properties in process of foreclosure |  | 400,000 |  | 400,000 | 100,000
Commercial real estate- non owner-occupied [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  | 8,000 |  | 8,000 | 33,000
Commercial real estate- non owner-occupied [Member] | Special Mention [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Increase in non-accrual status |  |  |  | $ 7,900,000 |
Number of loans that increased non accrual balance in Special Mention | loan |  |  |  | 1 |
Commercial real estate- all other CRE [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  | 890,000 |  | $ 890,000 | 647,000
Commercial real estate- all other CRE [Member] | Substandard [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Increase in non-accrual status |  |  |  | $ 10,100,000 |
Number of well collateralized loans that increased balance of substandard category | loan |  |  |  | 3 |
Acquisition and development- All other A&D [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  | $ 366,000 |  | $ 366,000 | 8,058,000
Commercial and industrial [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  |  |  |  | 30,000
Number of loans that decreased non accrual balance | loan |  | 1 |  |  |
Commercial and industrial [Member] | Medical Profession Loan [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans that increased non accrual balance in Special Mention | loan |  |  |  | 1 |
Commercial and industrial [Member] | Relationship With Chartered Airline Company [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans that increased non accrual balance in Special Mention | loan |  |  |  | 1 |
Residential mortgage- term [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  | $ 1,634,000 |  | $ 1,634,000 | 1,219,000
Residential mortgage- home equity [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  | 414,000 |  | 414,000 | 858,000
Consumer [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans |  | $ 27,000 |  | $ 27,000 | $ 4,000

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