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Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 01, 2018
Jul. 01, 2017
Feb. 22, 2017
Aug. 22, 2016
Mar. 17, 2014
Mar. 31, 2012
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2007
Dec. 31, 2005
Dec. 31, 2003
Debt Instrument [Line Items]                        
Unused lines of credit             $ 3,159,942,000          
Penalty on prepayment of debt             54,000 $ 0 $ 205,000      
Subordinated notes                        
Debt Instrument [Line Items]                        
Par percentage       100.00%                
Redemption price percentage       100.00%                
PHC Statutory Trust I                        
Debt Instrument [Line Items]                        
Fixed interest rate         5.49%              
PHC Statutory Trust I | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate         2.85%             285.00%
PHC Statutory Trust II | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                     187.00%  
Heritage Financial Statutory Trust I | Subordinated notes                        
Debt Instrument [Line Items]                        
Redemption of debenture     $ 10,515,000                  
Aggregate principal amount     10,310,000                  
Prepayment penalty     $ 205,000                  
Capital Bancorp Capital Trust I                        
Debt Instrument [Line Items]                        
Fixed interest rate           4.42%            
Junior subordinated notes             106,624,000          
Threshold of assets to lose tier 1 treatment             15,000,000,000          
Capital Bancorp Capital Trust I | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate           1.50%       150.00%    
First M&F Statutory Trust I                        
Debt Instrument [Line Items]                        
Junior subordinated notes             $ 8,902,000 9,450,000        
Interest rate of senior note             4.18%          
First M&F Statutory Trust I | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate             133.00%          
Brand Group Holdings Statutory Trust I | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 205.00%                      
Brand Group Holdings Statutory Trust II | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 300.00%                      
Brand Group Holdings Statutory Trust III | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 300.00%                      
Brand Group Holdings Statutory Trust IV | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 375.00%                      
Brand Group Holdings Statutory Trust                        
Debt Instrument [Line Items]                        
Unamortized discount             $ 474,000          
5.00% Subordinated Notes due 2026 | Subordinated notes                        
Debt Instrument [Line Items]                        
Interest rate of senior note       5.00%                
Aggregate principal amount       $ 60,000,000                
5.00% Subordinated Notes due 2026 | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   384.00%    
5.50% Subordinated Notes due 2031 | Subordinated notes                        
Debt Instrument [Line Items]                        
Interest rate of senior note       5.50%                
Aggregate principal amount       $ 40,000,000                
5.50% Subordinated Notes due 2031 | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                   407.10%    
Metropolitan Notes | Subordinated notes                        
Debt Instrument [Line Items]                        
Interest rate of senior note   6.50%                    
Borrowings   $ 15,000,000                    
Metropolitan Notes | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   554.50%                    
Brand Notes | Subordinated notes                        
Debt Instrument [Line Items]                        
Interest rate of senior note 8.50%                      
Debt prepayment cost             900,000          
Borrowings $ 30,000,000                      
Federal Home Loan Bank                        
Debt Instrument [Line Items]                        
Extinguishment of debt, amount             2,094,000 $ 0 $ 0      
Penalty on prepayment of debt             $ 54,000          
Minimum                        
Debt Instrument [Line Items]                        
Long-term advances, interest rates             1.09%          
Minimum | 5.00% Subordinated Notes due 2026 | LIBOR | Subordinated notes                        
Debt Instrument [Line Items]                        
Variable rate threshold       0.00%                
Maximum                        
Debt Instrument [Line Items]                        
Long-term advances, interest rates             4.34%          
Weighted Average                        
Debt Instrument [Line Items]                        
Long-term advances, interest rates             1.53% 3.28%