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Loans and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Mar. 03, 2017
Accretion of loan discount |  |  | $ 1,908 |
Recorded loans with a fair value |  |  |  | $ 497,400
Remaining accretable yield associated with PCI loans | $ 3,500 | $ 0 |  |
Accretable Yield recognized | 85 | 0 |  |
Accretion of loan discount resolved | 443 |  |  |
Additional loan interest income resolved | 295 |  |  |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |  |
Nonaccrual loans in process of foreclosure | 1,600 |  | $ 1,700 |
Carolina Bank Holdings, Inc. [Member] |  |  |  |
Recorded loans with a fair value |  |  |  | 19,300
Purchased Impaired Loans [Member] |  |  |  |
Accretion of loan discount |  | 39 |  |
Payments that exceeded the initial carrying amount on purchased impaired loans |  | 46 |  |
Additional loan interest income |  | $ 7 |  |
Recorded loans with a fair value |  |  |  | $ 19,300
Remaning discount | 402 |  |  |
Purchased Impaired Loans [Member] | Carolina Bank Holdings, Inc. [Member] |  |  |  |
Recorded loans with a fair value | 1,700 |  |  |
Non-Covered Purchased Nonimpaired Loans [Member] |  |  |  |
Accretion of loan discount | 1,360 |  |  |
Remaining loan discount for non-covered purchased accruing loans | $ 18,410 |  |  |

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