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Stock Options and Restricted Shares - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2015 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 4,443 | $ 4,148 | $ 5,501 | $ 5,018 | $ 5,160 | $ 4,913 | $ 14,092 | $ 15,091
Remaining Share-Based Compensation on Unvested Restricted Stock Awards |  | $ 40,700 |  |  |  |  |  | $ 40,700 |
Weighted Average Remaining Period of Sharebased Compensation Expense |  |  |  |  |  |  |  | 1 year 10 months 9 days |
2018 Equity Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for issuances (in shares) |  | 808,000 |  |  |  |  |  | 808,000 |
BNC Bancorp 2013 Omnibus Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for issuances (in shares) |  | 0 |  |  |  |  |  | 0 |
Plans other than 2018 Omnibus Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for issuances (in shares) |  | 0 |  |  |  |  |  | 0 |
CapitalMark Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for issuances (in shares) |  | 0 |  |  |  |  |  | 0 |
Shares acquired in period (in shares) | 858,000 |  |  |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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