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Stock Options and Restricted Shares - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 31, 2015
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Issued During Period, Value, Restricted Stock Award, Gross       $ 8,751,000 $ 8,633,000
Stock-based compensation expense   $ 4,300,000 $ 5,200,000 $ 8,751,000 $ 8,633,000
2014 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for issuances (in shares)   500,000   500,000  
2018 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for issuances (in shares)   1,200,000   1,200,000  
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   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   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        
Magna, Avenue or BNC          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for issuances (in shares)   0   0