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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Purchased Credit Impaired Loans (substantially all of which are covered loans) |  |
Balance, beginning, carrying value | $ 514 | $ 1,970
Change due to payments received and accretion | (6,016) | (1,386)
Change due to loan charge-offs | (12) | (70)
Transfers to foreclosed real estate | (69) |
Other | (392) |
Balance, ending, carrying value | 23,165 | 514
Carolina Bank [Member] |  |
Purchased Credit Impaired Loans (substantially all of which are covered loans) |  |
Additions due to acquisition | 19,254 |
Asheville Savings Bank [Member] |  |
Purchased Credit Impaired Loans (substantially all of which are covered loans) |  |
Additions due to acquisition | 9,886 |
Accretable Yield for PCI loans [Member] |  |
Purchased Credit Impaired Loans (substantially all of which are covered loans) |  |
Balance, beginning, carrying value |  |
Accretion | (1,846) |
Reclassification from (to) nonaccretable difference | 423 |
Other | 690 |
Balance, ending, carrying value | 4,688 |
Accretable Yield for PCI loans [Member] | Carolina Bank [Member] |  |
Purchased Credit Impaired Loans (substantially all of which are covered loans) |  |
Additions due to acquisition | 3,617 |
Accretable Yield for PCI loans [Member] | Asheville Savings Bank [Member] |  |
Purchased Credit Impaired Loans (substantially all of which are covered loans) |  |
Additions due to acquisition | $ 1,804 |

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Balance Type: | credit
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- Definition Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount of decrease from reclassification to nonaccretable difference of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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