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Loans and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Mar. 03, 2017
Accretion of loan discount |  |  |  | $ 1,908 |  |
Recoveries | $ 1,775 | $ 1,658 | $ 5,367 | 5,081 | $ 6,685 |
Recorded loans with a fair value |  |  |  |  |  | $ 497,500
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |  |  |  |
Nonaccrual loans in process of foreclosure | 900 |  | 900 |  | $ 1,700 |
Purchased Impaired Loans [Member] |  |  |  |  |  |
Accretion of loan discount |  |  | 775 | 780 |  |
Payments that exceeded the initial carrying amount on purchased impaired loans |  |  | 848 | 1,108 |  |
Recoveries |  |  |  | 33 |  |
Additional loan interest income |  |  | 73 | $ 295 |  |
Recorded loans with a fair value |  |  |  |  |  | $ 19,300
Purchased Impaired Loans [Member] | Carolina Bank Holdings, Inc. [Member] | 90 Days or More Past Due [Member] |  |  |  |  |  |
Recorded loans with a fair value | $ 400 |  | $ 400 |  |  |

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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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