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BORROWINGS - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended
Nov. 15, 2024
Oct. 01, 2021
Oct. 05, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Nov. 05, 2019
Debt Instrument [Line Items]                    
Subordinated debt       $ 230,300,000     $ 230,300,000   $ 209,406,000  
Repayments of subordinated debt             10,310,000 $ 0    
Long-term debt       1,137,216,000     1,137,216,000   936,788,000  
FHLB advances       444,200,000     444,200,000   513,800,000  
Federal Home Loan Bank Advances                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       2,300,000,000     2,300,000,000   2,400,000,000  
Line of credit       444,200,000     444,200,000   513,800,000  
Loans pledged as collateral                 1,000,000,000.0  
Federal Home Loan Bank Advances | Residential mortgage                    
Debt Instrument [Line Items]                    
Loans pledged as collateral       1,000,000,000.0     1,000,000,000.0      
Federal Home Loan Bank Advances | Commercial real estate loans                    
Debt Instrument [Line Items]                    
Loans pledged as collateral       2,700,000,000     2,700,000,000   1,900,000,000  
Federal Home Loan Bank Advances | Home equity lines of credit                    
Debt Instrument [Line Items]                    
Loans pledged as collateral       227,000,000.0     227,000,000.0   266,800,000  
Federal Home Loan Bank Advances | Multifamily loans                    
Debt Instrument [Line Items]                    
Loans pledged as collateral       235,700,000     235,700,000   109,700,000  
Federal Reserve and correspondent banks                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       366,500,000     366,500,000   463,300,000  
Unsecured lines of credit, correspondent banks                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       780,000,000.0     780,000,000.0   730,000,000.0  
Revere acquisition                    
Debt Instrument [Line Items]                    
FHLB advances       168,400,000     168,400,000      
Fair value of debt premium       5,800,000     5,800,000      
Extinguishment of debt         $ 115,400,000          
Debt prepayment cost         5,900,000          
Remaining unamortized fair value premium         5,800,000          
FHLB advances acquisition date fully matured during the period         $ 53,000,000.0          
Subordinated Debt                    
Debt Instrument [Line Items]                    
Subordinated debt       $ 230,300,000     $ 230,300,000   199,009,000  
Interest rate       4.25%     4.25%      
Purchase accounting premium       $ 1,954,000     $ 1,954,000   1,894,000  
Subordinated Debt | Fixed Floating Rate Subordinated Notes                    
Debt Instrument [Line Items]                    
Subordinated debt                   $ 175,000,000.0
Interest rate                   4.25%
Unamortized discount (premium) and debt issuance costs, net       2,900,000     2,900,000      
Subordinated Debt | London Interbank Offered Rate (LIBOR) | Subsequent Event | Forecast | Fixed Floating Rate Subordinated Notes                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 2.62%                  
Subordinated Debt | WashingtonFirst Bankshares Inc                    
Debt Instrument [Line Items]                    
Subordinated debt       $ 25,000,000.0     $ 25,000,000.0      
Interest rate       6.00%     6.00%      
Purchase accounting premium       $ 2,200,000     $ 2,200,000      
Subordinated Debt | WashingtonFirst Bankshares Inc | London Interbank Offered Rate (LIBOR) | Subsequent Event | Forecast                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     4.67%              
Subordinated Debt | Revere acquisition                    
Debt Instrument [Line Items]                    
Subordinated debt       $ 31,000,000.0     $ 31,000,000.0      
Interest rate       5.625%     5.625%      
Purchase accounting premium       $ 200,000     $ 200,000      
Subordinated Debt | Revere acquisition | Subsequent Event | Forecast                    
Debt Instrument [Line Items]                    
Basis spread on variable rate   4.41%                
Retail Repurchase Agreements                    
Debt Instrument [Line Items]                    
Long-term debt       142,300,000     142,300,000   138,600,000  
Federal Funds Purchased                    
Debt Instrument [Line Items]                    
Long-term debt       70,000,000.0     70,000,000.0   75,000,000.0  
Federal funds under the PPPLF program                    
Debt Instrument [Line Items]                    
Long-term debt       250,400,000     250,400,000      
Remaining borrowing capacity       837,700,000     837,700,000      
Borrowings repaid       594,600,000            
Junior Subordinated Debt                    
Debt Instrument [Line Items]                    
Subordinated debt       0     0   10,397,000  
Purchase accounting premium       0     0   $ 87,000  
Junior Subordinated Debt | WashingtonFirst Bankshares Inc                    
Debt Instrument [Line Items]                    
Subordinated debt       10,300,000     10,300,000      
Purchase accounting premium       $ 100,000     $ 100,000      
Repayments of subordinated debt           $ 10,300,000