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Stock Options and Restricted Shares - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2015
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense   $ 5,160 $ 4,913 $ 4,303 $ 4,448 $ 10,073 $ 8,751
Remaining Share-Based Compensation on Unvested Restricted Stock Awards   $ 44,700       $ 44,700  
Weighted Average Remaining Period of Sharebased Compensation Expense           1 year 7 months 20 days  
2018 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for issuances (in shares)   1,300,000       1,300,000  
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)   8,000       8,000  
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