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Junior Subordinated Debentures (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Dec. 15, 2017
Investment Holdings [Line Items]      
Common securities of Trust I and Trust II owned $ 16,526,000 $ 16,526,000  
Royal Bancshares Capital Trust II      
Investment Holdings [Line Items]      
Capital securities issued, amount 12,500,000    
Common securities issued, amount 387,000    
Royal Bancshares Capital Trust I      
Investment Holdings [Line Items]      
Capital securities issued, amount 12,500,000    
Common securities issued, amount $ 387,000    
Junior Subordinated Debentures, RBPI Merger | Junior Subordinated Debt      
Investment Holdings [Line Items]      
Coupon rate (as a percent) 4.76%    
Junior Subordinated Debentures, RBPI Merger | Junior Subordinated Debt | LIBOR      
Investment Holdings [Line Items]      
Basis spread on variable rate 2.15%    
Royal Bancshares of Pennsylvania, Inc.      
Investment Holdings [Line Items]      
Junior subordinated debentures     $ 21,400,000
Royal Bancshares of Pennsylvania, Inc. | Royal Bancshares Capital Trust I      
Investment Holdings [Line Items]      
Junior subordinated debentures     10,700,000
Royal Bancshares Capital Trust I and II      
Investment Holdings [Line Items]      
Common securities of Trust I and Trust II owned     774,000
Royal Bancshares Capital Trust I      
Investment Holdings [Line Items]      
Common securities of Trust I and Trust II owned $ 387,000    
Royal Bancshares Capital Trust II      
Investment Holdings [Line Items]      
Common securities of Trust I and Trust II owned $ 387,000    
Royal Bancshares Capital Trust II | Royal Bancshares of Pennsylvania, Inc.      
Investment Holdings [Line Items]      
Junior subordinated debentures     $ 10,700,000