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Stock Options and Restricted Shares - Narrative (Details) - USD ($)
3 Months Ended
Jul. 31, 2015
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense   $ 4,913,000 $ 4,448,000
Remaining Share-Based Compensation on Unvested Restricted Stock Awards   $ 49,100,000  
Weighted Average Remaining Period of Sharebased Compensation Expense   1 year 9 months 7 days  
2018 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for issuances (in shares)   1,250,000  
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)   9,000  
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  
CapitalMark Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for issuances (in shares)   0  
Shares acquired in period (in shares) 858,000