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Loans and Asset Quality Information (Summary of Nonperforming Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 01, 2017	Mar. 03, 2017
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual loans	$ 24,866	$ 22,575
Total loans	4,451,525	4,247,765	$ 4,043,355
Foreclosed properties	3,873	7,440
Purchased credit impaired loans not included above	12,664	17,393
Nonperforming assets
Loans and Leases Receivable Disclosure [Line Items]
Nonaccrual loans	24,866	22,575
TDRs- accruing	9,053	13,418
Accruing loans 90 days past due	0	0
Total loans	33,919	35,993
Foreclosed properties	3,873	7,440
Total nonperforming assets	37,792	43,433
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	$ 800	$ 600

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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.

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Amount of financing receivable modified as troubled debt restructuring.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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