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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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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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