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Loans and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Oct. 01, 2017	Mar. 03, 2017
Recorded loans with a fair value				$ 606,200	$ 497,500
Payments that exceeded the initial carrying amount on purchased impaired loans	$ 133	$ 68
Discount accretion loan interest income - purchased impaired loans paid off	112
Additional loan interest income - purchased impaired loans paid off	21
SBA Loans [Member]
Remaining unaccreted discount	6,200		$ 5,700
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
Nonaccrual loans in process of foreclosure	1,500		700
Purchased Impaired Loans [Member]
Recorded loans with a fair value				$ 9,900	$ 19,300
Purchased Impaired Loans [Member] | Carolina Bank Holdings, Inc. [Member] | 90 Days or More Past Due [Member]
Recorded loans with a fair value	600	$ 500	600
Purchased Non-Impaired Loans [Member]
Remaining accretable discount on purchased non-impaired loans	$ 14,100		$ 15,000

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Remaining accretable discount on purchased non-impaired loans.

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Amount, after accumulated amortization, of debt discount.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
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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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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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