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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 03, 2017 USD ($) $ / shares shares | Jul. 15, 2016 USD ($) | May 05, 2016 USD ($) shares | Jan. 02, 2016 USD ($) shares | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Shares issued pursuant to acquisition |  |  |  |  |  | $ 114,478 | $ 5,509 |
Goodwill |  |  |  |  | $ 139,124 | 139,124 | 73,541 | $ 75,042
Earn-out liability |  |  |  |  | 1,200 | 1,200 |  |
Premises and equipment sold |  |  |  |  |  |  | 21 |
Allowance for loan losses |  |  |  |  | 24,025 | 24,025 | 26,023 | 23,781
Total assets |  |  |  |  | 4,528,620 | 4,528,620 | 3,466,546 | 3,614,862
Total deposits |  |  |  |  | 3,644,330 | 3,644,330 | 2,872,020 | 2,947,353
Total loans |  |  |  |  | 3,375,976 | 3,375,976 | $ 2,598,134 | $ 2,710,712
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 | $ 114,478 |  |  |  |  |  |  |
Goodwill | 65,302 |  |  |  |  |  |  |
Premises and equipment | 17,967 |  |  |  |  |  |  |
Other liabilities | 12,855 |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |
Payments for acquisition per share | $ / shares | $ 20.00 |  |  |  |  |  |  |
Merger share conversion ratio | 1.002 |  |  |  |  |  |  |
Contribution of cash in total consideration | 25.00% |  |  |  |  |  |  |
Contribution of stock in total consideration | 75.00% |  |  |  |  |  |  |
Closing stock price | $ / shares | $ 30.13 |  |  |  |  |  |  |
Carolina Bank [Member] | Post Merger [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Merger Related Expenses |  |  |  |  |  | 3,200 |  |
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 |  |  |  |  |  |  |

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