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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2017 USD ($) $ / shares shares | Sep. 01, 2017 USD ($) shares | Mar. 03, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Shares issued pursuant to acquisition |  |  |  | $ 114,893 |  |
Goodwill |  |  |  | 144,667 | $ 232,458 | $ 233,070
Total assets |  |  |  | 4,591,147 | 5,711,630 | 5,547,037
Total deposits |  |  |  | 3,651,241 | 4,528,373 | 4,406,955
Total loans |  |  |  | 3,429,755 | $ 4,190,628 | $ 4,042,369
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 |  |  | $ 65,072 |  |  |
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] | Pre Merger [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Merger Related Expenses |  |  |  | 4,600 |  |
Merger Related Expenses net of tax |  |  |  | $ 3,100 |  |
Basic and Diluted | $ / shares |  |  |  | $ 0.12 |  |
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 |  |  |  |
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 | $ 88,235 |  |  |  |  |
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] | Deposit Liabilities [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful life of acquired intangible assets | 5 years |  |  |  |  |
Asheville Savings Bank [Member] | Core Deposit Intangible [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful life of acquired intangible assets | 7 years |  |  |  |  |

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