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Loans and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 01, 2017 | Mar. 03, 2017
Recorded loans with a fair value |  |  |  | $ 606,200 | $ 497,500
Loans pledged as collateral | $ 3,600,000 | $ 2,400,000 |  |  |
Loans to officers and directors | 3,600 | 2,600 |  |  |
Additions to loans, officers and directors | 600 |  |  |  |
Payments that exceeded the initial carrying amount on purchased impaired loans | 1,064 | 1,160 |  |  |
Discount accretion loan interest income - purchased impaired loans paid off | 962 | 786 |  |  |
Additional loan interest income - purchased impaired loans paid off | 102 | 296 |  |  |
Recoveries |  | 78 |  |  |
Interest income on non accrual loans | 415 | 266 | $ 575 |  |
Interest income on restructured loans | 297 | 423 | 1,392 |  |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |  |  |
Nonaccrual loans in process of foreclosure | 800 | 1,700 |  |  |
Non Accrual Loans [Member] |  |  |  |  |
Interest income forgone | 1,503 | 1,893 | 3,213 |  |
Restructured Loans [Member] |  |  |  |  |
Interest income forgone | 1,182 | 1,417 | $ 2,044 |  |
Purchased Impaired Loans [Member] |  |  |  |  |
Recorded loans with a fair value |  |  |  | $ 9,900 | $ 19,300
Accretion of loan discount | 21,500 | $ 12,100 |  |  |
Purchased Impaired Loans [Member] | Carolina Bank Holdings, Inc. [Member] | 90 Days or More Past Due [Member] |  |  |  |  |
Recorded loans with a fair value | $ 600 |  |  |  |

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