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BORROWINGS - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended
Apr. 01, 2020
Nov. 05, 2019
Dec. 31, 2020
Sep. 30, 2021
Oct. 05, 2020
Debt Instrument [Line Items]          
Long-term borrowings     $ 227,088,000 $ 172,639,000  
Long-term debt     1,149,320,000 320,143,000  
FHLB advances     379,100,000 0  
Federal Home Loan Bank Advances          
Debt Instrument [Line Items]          
FHLB advances repaid       279,000,000  
FHLB prepayment penalties       9,100,000  
Maximum borrowing capacity     3,000,000,000 3,900,000,000  
Federal Home Loan Bank Advances | Residential mortgage          
Debt Instrument [Line Items]          
Loans pledged as collateral     1,000,000,000 786,800,000  
Federal Home Loan Bank Advances | Commercial real estate loans          
Debt Instrument [Line Items]          
Loans pledged as collateral     2,800,000,000 2,800,000,000  
Federal Home Loan Bank Advances | Home equity lines of credit          
Debt Instrument [Line Items]          
Loans pledged as collateral     226,200,000 226,400,000  
Federal Home Loan Bank Advances | Multifamily loans          
Debt Instrument [Line Items]          
Loans pledged as collateral     237,600,000 303,200,000  
Federal Reserve and correspondent banks          
Debt Instrument [Line Items]          
Maximum borrowing capacity     276,200,000 108,600,000  
Line of credit     0 0  
Unsecured lines of credit, correspondent banks          
Debt Instrument [Line Items]          
Maximum borrowing capacity     1,100,000,000 1,400,000,000  
Line of credit     390,000,000 0  
Subordinated Debt          
Debt Instrument [Line Items]          
Add: Purchase accounting premium     $ 1,669,000 0  
Subordinated Debt | Fixed Floating Rate Subordinated Notes          
Debt Instrument [Line Items]          
Long-term borrowings   $ 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      
Subordinated Debt | WashingtonFirst Bankshares Inc          
Debt Instrument [Line Items]          
Long-term borrowings       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          
Debt Instrument [Line Items]          
Long-term borrowings $ 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        
Retail Repurchase Agreements          
Debt Instrument [Line Items]          
Long-term debt     $ 153,200,000 $ 147,500,000  
Federal Funds Purchased          
Debt Instrument [Line Items]          
Long-term debt     $ 390,000,000 0  
Federal funds under the PPPLF program          
Debt Instrument [Line Items]          
Long-term debt       $ 0