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Loans and Asset Quality Information (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 01, 2017	Mar. 03, 2017
Recorded loans with a fair value				$ 606,200,000	$ 497,500,000
Loans pledged as collateral	$ 3,800,000,000	$ 3,600,000,000
Loans to officers and directors	5,700,000	3,600,000
Additions to loans, officers and directors	2,100,000
Remaining unaccreted discount	2,941,000	3,122,000
Payments that exceeded the initial carrying amount on purchased impaired loans	772,000	1,064,000
Discount accretion loan interest income - purchased impaired loans paid off	493,000	962,000
Additional loan interest income - purchased impaired loans paid off	279,000	102,000
Recoveries	750,000
Interest income on restructured loans	763,000	885,000	$ 423,000
SBA Loans [Member]
Remaining unaccreted discount	5,700,000	2,600,000
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
Nonaccrual loans in process of foreclosure	700,000	800,000
Non Accrual Loans [Member]
Interest income forgone	1,616,000	1,503,000	1,893,000
Restructured Loans [Member]
Interest income on non accrual loans	765,000	415,000	266,000
Interest income forgone	974,000	1,182,000	$ 1,417,000
Purchased Impaired Loans [Member]
Recorded loans with a fair value				$ 9,900,000	$ 19,300,000
Purchased Impaired Loans [Member] | Carolina Bank and Asheville Savings Bank [Member] | 90 Days or More Past Due [Member]
Recorded loans with a fair value	600,000	600,000
Purchased Non-Impaired Loans [Member]
Remaining accretable discount on purchased non-impaired loans	$ 15,000,000	$ 21,500,000

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Interest and fee income, actually collected, generated by loans the Entity intends and has the ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity.

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