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Loans and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | 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 | $ 225 | $ 848 |  |  |
Discount accretion loan interest income - purchased impaired loans paid off | 184 | 775 |  |  |
Additional loan interest income - purchased impaired loans paid off | 41 | 73 |  |  |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |  |  |
Nonaccrual loans in process of foreclosure | 1,400 |  | $ 800 |  |
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 | $ 400 | $ 600 |  |

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