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Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 03, 2020
Jul. 01, 2017
Aug. 22, 2016
Mar. 17, 2014
Mar. 31, 2012
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Dec. 31, 2007
Dec. 31, 2005
Dec. 31, 2003
Oct. 31, 2021
Debt Instrument [Line Items]                          
Penalty on prepayment of debt           $ 121,000 $ 54,000 $ 0          
Subordinated notes                          
Debt Instrument [Line Items]                          
Par percentage     100.00%                    
Redemption price percentage     100.00%                    
FHLB Advances                          
Debt Instrument [Line Items]                          
Unused lines of credit           3,784,520,000              
Penalty on prepayment of debt           $ 121,000              
FHLB Advances | Forecast                          
Debt Instrument [Line Items]                          
Interest rate of senior note                         1.358%
FHLB Advances | LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate           0.50%              
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%               2.85%  
PHC Statutory Trust II | LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate                     1.87%    
Capital Bancorp Capital Trust I                          
Debt Instrument [Line Items]                          
Fixed interest rate         4.42%                
Junior subordinated notes           $ 107,203,000              
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%         1.50%      
First M&F Statutory Trust I                          
Debt Instrument [Line Items]                          
Interest rate of senior note                 4.18%        
Junior subordinated notes           8,354,000 8,902,000            
First M&F Statutory Trust I | LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate                 1.33%        
Brand Group Holdings Statutory Trust I | LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate               2.05%          
Brand Group Holdings Statutory Trust II | LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate               3.00%          
Brand Group Holdings Statutory Trust III | LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate               3.00%          
Brand Group Holdings Statutory Trust IV | LIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate               3.75%          
Brand Group Holdings Statutory Trust                          
Debt Instrument [Line Items]                          
Unamortized discount           443,000 $ 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                   3.84%      
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                   4.071%      
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   5.545%                      
4.50% Fixed-to-Floating Rate Subordinated Notes Due 2035 | Subordinated notes                          
Debt Instrument [Line Items]                          
Interest rate of senior note 4.50%                        
Aggregate principal amount $ 100,000,000                        
Par percentage 100.00%                        
4.50% Fixed-to-Floating Rate Subordinated Notes Due 2035 | SOFR | Subordinated notes                          
Debt Instrument [Line Items]                          
Basis spread on variable rate 4.025%                        
Brand Notes | Subordinated notes                          
Debt Instrument [Line Items]                          
Interest rate of senior note             8.50%            
Repurchase amount             $ 30,000,000            
Debt prepayment cost             900,000            
Federal Home Loan Bank                          
Debt Instrument [Line Items]                          
Extinguishment of debt, amount           $ 0 2,094,000 $ 0          
Penalty on prepayment of debt             $ 54,000            
Minimum | FHLB Advances                          
Debt Instrument [Line Items]                          
Long-term advances, interest rates           0.00%              
Minimum | 5.00% Subordinated Notes due 2026 | LIBOR | Subordinated notes                          
Debt Instrument [Line Items]                          
Variable rate threshold     0.00%                    
Maximum | FHLB Advances                          
Debt Instrument [Line Items]                          
Long-term advances, interest rates           4.34%              
Weighted Average | FHLB Advances                          
Debt Instrument [Line Items]                          
Long-term advances, interest rates           0.05% 1.53%