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Loans and Asset Quality Information - Summary of Nonperforming Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 01, 2017 | Mar. 03, 2017
--- | --- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Nonaccrual loans | $ 35,076 | $ 24,866 |  |  |
Total loans | 4,735,013 | 4,451,525 | $ 4,247,765 |  |
Foreclosed properties | 2,424 | 3,873 |  |  |
Purchased credit impaired loans not included above | 8,591 | 12,664 |  |  |
Nonperforming assets |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Nonaccrual loans | 35,076 | 24,866 |  |  |
TDRs- accruing | 9,497 | 9,053 |  |  |
Accruing loans 90 days past due | 0 | 0 |  |  |
Total loans | 44,573 | 33,919 |  |  |
Foreclosed properties | 2,424 | 3,873 |  |  |
Total nonperforming assets | 46,997 | 37,792 |  |  |
Carolina Bank | Purchased Impaired Loans |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded loans with a fair value |  |  |  |  | $ 19,300
Asheville Savings Bank | Purchased Impaired Loans |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded loans with a fair value |  |  |  | $ 9,900 |
Carolina Bank and Asheville Savings Bank | Accruing 90 Days or More Past Due | Purchased Impaired Loans |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded loans with a fair value | $ 700 | $ 800 |  |  |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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