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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Oct. 01, 2017 USD ($) $ / shares shares | Sep. 01, 2017 USD ($) shares | Mar. 03, 2017 USD ($) $ / shares shares | Mar. 03, 2017 USD ($) $ / shares | Jul. 15, 2016 USD ($) | May 05, 2016 USD ($) shares | Jan. 02, 2016 USD ($) shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition |  |  |  |  |  |  |  |  | $ 284,192 | $ 5,509 |
Goodwill |  |  |  |  |  |  |  |  | 233,070 | 75,042 |
Loans sold |  |  |  |  |  |  |  |  | 77,034 | 20,021 |
Premises and equipment sold |  |  |  |  |  |  |  |  | 151 | 2,025 | $ 1,621
Core deposit intangible | $ 9,760 |  | $ 8,790 | $ 8,790 | $ 1,170 |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  | 5,547,037 | 3,614,862 |
Total deposits |  |  |  |  |  |  |  |  | 4,406,955 | 2,947,353 |
Total loans |  |  |  |  |  |  |  |  | 4,042,369 | $ 2,710,712 |
Asheville Savings Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for acquisition | $ 17,900 |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition, shares | shares | 4,920,061 |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition | $ 169,300 |  |  |  |  |  |  |  |  |  |
Goodwill | 88,400 |  |  |  |  |  |  |  |  |  |
Premises and equipment | 10,697 |  |  |  |  |  |  |  |  |  |
Other liabilities | 8,943 |  |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |  |  |
Payments for acquisition per share | $ / shares | $ 41.90 |  |  |  |  |  |  |  |  |  |
Merger share conversion ratio | 1.44 |  |  |  |  |  |  |  |  |  |
Contribution of cash in total consideration | 10.00% |  |  |  |  |  |  |  |  |  |
Contribution of stock in total consideration | 90.00% |  |  |  |  |  |  |  |  |  |
Closing stock price | $ / shares | $ 34.41 |  |  |  |  |  |  |  |  |  |
Asheville Savings Bank [Member] | Post Merger [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger Related Expenses |  |  |  |  |  |  |  |  | 2,700 |  |
Asheville Savings Bank [Member] | Pre Merger [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger Related Expenses |  |  |  |  |  |  |  |  | 20,400 |  |
Asheville Savings Bank [Member] | Deposit Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of acquired intangible assets | 5 years |  |  |  |  |  |  |  |  |  |
Bankingport, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  | $ 2,200 |  |  |  |
Payments for acquisition |  |  |  |  |  |  | $ 700 |  |  |  |
Shares issued pursuant to acquisition, shares | shares |  |  |  |  |  |  | 79,012 |  |  |  |
Shares issued pursuant to acquisition |  |  |  |  |  |  | $ 1,500 |  |  |  |
Payment for purchase of office space |  |  |  |  |  |  | 1,100 |  |  |  |
Goodwill |  |  |  |  |  |  | 1,700 |  |  |  |
Other amortizable intangible assets |  |  |  |  |  |  | $ 700 |  |  |  |
SBA Complete, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  | $ 8,500 |  |  |  |  |
Payments for acquisition |  |  |  |  |  | $ 1,500 |  |  |  |  |
Shares issued pursuant to acquisition, shares | shares |  |  |  |  |  | 199,829 |  |  |  |  |
Shares issued pursuant to acquisition |  |  |  |  |  | $ 4,000 |  |  |  |  |
Goodwill |  |  |  |  |  | 5,600 |  |  |  |  |
Other amortizable intangible assets |  |  |  |  |  | 2,000 |  |  |  |  |
Earn-out liability |  |  |  |  |  | $ 3,000 |  |  |  |  |
Earn-out liability payment period |  |  |  |  |  | 3 years |  |  |  |  |
Measurement period adjustment for earn-out liability and goodwill |  |  |  |  |  |  |  | $ 1,200 |  |  |
First Community Bank branches [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 5,400 |  |  |  |  |  |
Loans sold |  |  |  |  | 150,600 |  |  |  |  |  |
Premises and equipment sold |  |  |  |  | 5,700 |  |  |  |  |  |
Deposits sold |  |  |  |  | 134,300 |  |  |  |  |  |
Deposit premium |  |  |  |  | 3,800 |  |  |  |  |  |
Allowance for loan losses |  |  |  |  | 1,000 |  |  |  |  |  |
Write off of goodwill |  |  |  |  | 3,500 |  |  |  |  |  |
Gain loss on acquisition |  |  |  |  | 1,500 |  |  |  |  |  |
Acquired assets fair value |  |  |  |  | 157,200 |  |  |  |  |  |
Premises and equipment |  |  |  |  | 3,400 |  |  |  |  |  |
Other liabilities |  |  |  |  | 200 |  |  |  |  |  |
Discount on acquired loans |  |  |  |  | 1,500 |  |  |  |  |  |
Premium on deposits |  |  |  |  | 300 |  |  |  |  |  |
Core deposit intangible |  |  |  |  | 1,200 |  |  |  |  |  |
Total deposits |  |  |  |  | 111,300 |  |  |  |  |  |
Total loans |  |  |  |  | $ 152,200 |  |  |  |  |  |
Carolina Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for acquisition |  |  | $ 25,300 |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition, shares | shares |  |  | 3,799,471 |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition |  |  | $ 114,500 |  |  |  |  |  |  |  |
Goodwill |  |  | 65,516 | 65,516 |  |  |  |  |  |  |
Premises and equipment |  |  | 17,967 | 17,967 |  |  |  |  |  |  |
Other liabilities |  |  | 12,855 | 12,855 |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |  |  |
Payments for acquisition per share | $ / shares |  |  | $ 20.00 | $ 20.00 |  |  |  |  |  |  |
Merger share conversion ratio |  |  | 1.002 |  |  |  |  |  |  |  |
Contribution of cash in total consideration |  |  | 25.00% | 25.00% |  |  |  |  |  |  |
Contribution of stock in total consideration |  |  | 75.00% | 75.00% |  |  |  |  |  |  |
Closing stock price | $ / shares |  |  | $ 30.13 | $ 30.13 |  |  |  |  |  |  |
Carolina Bank [Member] | Post Merger [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger Related Expenses |  |  |  |  |  |  |  |  | 5,200 |  |
Carolina Bank [Member] | Pre Merger [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger Related Expenses |  |  |  |  |  |  |  |  | $ 4,600 |  |
Carolina Bank [Member] | Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of acquired intangible assets |  |  |  | 18 years |  |  |  |  |  |  |
Carolina Bank [Member] | Deposit Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of acquired intangible assets |  |  |  | 5 years |  |  |  |  |  |  |
Carolina Bank [Member] | Core Deposit Intangible [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life of acquired intangible assets |  |  |  | 7 years |  |  |  |  |  |  |
Bear Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | $ 9,800 |  |  |  |  |  |  |  |  |
Payments for acquisition |  | $ 7,900 |  |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition, shares | shares |  | 13,374 |  |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition |  | $ 400 |  |  |  |  |  |  |  |  |
Goodwill |  | 5,300 |  |  |  |  |  |  |  |  |
Other amortizable intangible assets |  | 3,900 |  |  |  |  |  |  |  |  |
Annual commission income |  | 4,000 |  |  |  |  |  |  |  |  |
Earn-out liability |  | $ 1,200 |  |  |  |  |  |  |  |  |

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