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Summary of Significant Accounting Policies - Investment - (Details)
6 Months Ended
Jun. 30, 2017
trust
$ / shares
Jan. 30, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
Noncontrolling Interest [Line Items]      
Number of Delaware trust affiliates | trust 2    
Royal Bank | Crusader Servicing Corporation      
Noncontrolling Interest [Line Items]      
Total percentage of ownership interest (in hundredths) 80.00%    
Royal Bank | Royal Bank America Leasing LP      
Noncontrolling Interest [Line Items]      
Total percentage of ownership interest (in hundredths) 60.00%    
Class A - Common stock      
Noncontrolling Interest [Line Items]      
Common stock, par value (in dollars per share) $ 2   $ 2
Class A - Common stock | Bryn Mawr Bank Corporation      
Noncontrolling Interest [Line Items]      
Number of shares received - per share | shares   0.1025  
Common stock, par value (in dollars per share)   $ 1.00  
Class B - Common stock      
Noncontrolling Interest [Line Items]      
Common stock, par value (in dollars per share) $ 0.10   $ 0.10
Class B - Common stock | Bryn Mawr Bank Corporation      
Noncontrolling Interest [Line Items]      
Number of shares received - per share | shares   0.1179