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BORROWINGS - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Apr. 01, 2020
Nov. 05, 2019
Mar. 31, 2020
Jul. 15, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Oct. 05, 2020
Subordinated debentures [Line Items]:                  
Subordinated debt           $ 172,712,000 $ 227,088,000    
Repayments of subordinated debt           $ 53,000,000 10,310,000 $ 0  
Percentage of principal and accrued interest of retail repurchase agreements collateralized           102.50%      
Federal Home Loan Bank Advances           $ 0 379,100,000    
Federal Home Loan Bank Advances                  
Subordinated debentures [Line Items]:                  
Line of credit amount available for borrowing           3,900,000,000 3,000,000,000    
Repayments of FHLB advances           279,000,000      
Prepayment penalty           9,100,000      
Federal Home Loan Bank Advances | Residential mortgage                  
Subordinated debentures [Line Items]:                  
Loans pledged as collateral           829,100,000      
Federal Home Loan Bank Advances | Commercial real estate loans                  
Subordinated debentures [Line Items]:                  
Loans pledged as collateral           3,100,000,000 2,800,000,000    
Federal Home Loan Bank Advances | HELOC                  
Subordinated debentures [Line Items]:                  
Loans pledged as collateral           224,400,000 226,200,000    
Federal Home Loan Bank Advances | Multifamily Loans                  
Subordinated debentures [Line Items]:                  
Loans pledged as collateral           333,400,000 237,600,000    
Federal Reserve and Correspondent Banks                  
Subordinated debentures [Line Items]:                  
Line of credit amount available for borrowing           509,400,000 276,200,000    
Long-term line of credit           0 0    
Unsecured lines of credit, correspondent banks                  
Subordinated debentures [Line Items]:                  
Line of credit amount available for borrowing           1,300,000,000 1,100,000,000    
Long-term line of credit           0 390,000,000    
Subordinated Debt                  
Subordinated debentures [Line Items]:                  
Subordinated debt           172,712,000 227,088,000    
Add: Purchase accounting premium           0 1,669,000    
Subordinated Debt | WashingtonFirst Bankshares Inc                  
Subordinated debentures [Line Items]:                  
Subordinated debt           25,000,000      
Interest rate                 6.00%
Basis spread on variable rate         4.57%        
Add: Purchase accounting premium           $ 2,200,000      
Debt instrument, term           10 years      
Subordinated Debt | Revere acquisition                  
Subordinated debentures [Line Items]:                  
Subordinated debt   $ 31,000,000              
Interest rate   5.625%              
Basis spread on variable rate 4.41%                
Add: Purchase accounting premium   $ 200,000              
Debt instrument, term   10 years              
Subordinated Debt | Fixed Floating Rate Subordinated Notes                  
Subordinated debentures [Line Items]:                  
Subordinated debt     $ 175,000,000            
Interest rate     4.25%            
Basis spread on variable rate     2.62%            
Unamortized discount (premium) and debt issuance costs, net     $ 2,900,000            
Junior Subordinated Debt | WashingtonFirst Bankshares Inc                  
Subordinated debentures [Line Items]:                  
Subordinated debt           $ 10,300,000      
Add: Purchase accounting premium           100,000      
Repayments of subordinated debt       $ 10,300,000          
Residential Portfolio Segment                  
Subordinated debentures [Line Items]:                  
Pledged under blanket lien             $ 1,000,000,000    
Federal funds under the PPPLF program                  
Subordinated debentures [Line Items]:                  
Long-term line of credit           $ 0