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Loans (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2019 | Jul. 01, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
PPP loans originated | $ 543,100,000 | $ 337,100,000 |  |  |  |
SBA PPP Fees received |  | 20,200,000 |  |  |  |
PPP loans |  | 337,100,000 |  |  |  |
SBA PPP Fees recognized |  | 13,700,000 |  |  |  |
Loans and Leases Receivable, Deferred Income |  | 23,600,000 | $ 16,300,000 |  |  |
Goodwill, Purchase Accounting Adjustments |  | (2,403,000) | (3,373,000) | $ (793,000) |  |
Deposit Liabilities Reclassified as Loans Receivable |  | 2,000,000.0 | 2,200,000 |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  |  |  |  | $ 589,698,000 | $ 277,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  | 578,577,000 | 272,800,000
Business Combination, Acquired Receivable, Fair Value |  |  |  |  | 578,577,000 |
Specific Reserves Related To Troubled Debt Restructuring |  | 200,000 | 2,200,000 |  |  |
TDRs included in nonaccrual loan totals |  | 25,800,000 | 34,300,000 |  |  |
Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  | 103,500,000 |  |  |  |
Consumer Loan [Member] | Other Restructuring |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  | 2,100,000 |  |  |  |
Consumer Loan [Member] | Covid Restructuring |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  | 949,000 |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  | 563,700,000 |  |  |  |
Commercial Portfolio Segment [Member] | Other Restructuring |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  | 6,300,000 |  |  |  |
Commercial Portfolio Segment [Member] | Covid Restructuring |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Financing Receivables, COVID Modifications, Recorded Investment, During Period |  | 109,000 |  |  |  |
Executive officers and directors |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Loans due from related party |  | 51,300,000 | 44,300,000 |  |  |
Loans and Leases Receivable, Related Parties, Additions |  | 600,000 | 9,200,000 |  |  |
Loans and Leases Receivable, Related Parties, Proceeds |  | 9,700,000 | 15,300,000 |  |  |
LoansAndLeasesReceivableRelatedPartiesAdvances |  | 12,400,000 | 8,900,000 |  |  |
Executive officers and directors | Loans |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Loans due from related party |  | 32,000,000.0 | 28,700,000 |  |  |
Carolina Alliance [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Business Combination, Acquired Receivables, Estimated Uncollectible |  | 9,500,000 | 11,300,000 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  | 1,700,000 | 3,200,000 |  |  | 5,100,000
Business Combination, Acquired Receivable, Fair Value |  | 1,600,000 | 3,000,000.0 |  |  | $ 4,900,000
Financial Asset Acquired with Credit Deterioration [Member] | NewDominion [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Allowance for Loan and Lease Losses, Loans Acquired |  | 1,000 | 101,000 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] | Carolina Alliance [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  | 11,800,000 | 13,800,000 |  | 19,900,000 |
Business Combination, Acquired Receivable, Fair Value |  |  |  |  | $ 18,400,000 |
Allowance for Loan and Lease Losses, Loans Acquired |  | 166,000 | 167,000 |  |  |
Loans |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  | 7,200,000 | $ 11,700,000 |  |  |
PPP Loans |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Deferred Income |  | $ 6,500,000 |  |  |  |

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