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BORROWINGS - Narrative (Detail) - USD ($)
3 Months Ended 6 Months Ended
Apr. 01, 2020
Nov. 05, 2019
Dec. 31, 2020
Jun. 30, 2021
Oct. 05, 2020
Debt Instrument [Line Items]          
Long-term borrowings     $ 227,088,000 $ 226,998,000  
Long-term debt     1,149,320,000 367,706,000  
FHLB advances     379,100,000 0  
Federal Home Loan Bank Advances          
Debt Instrument [Line Items]          
FHLB advances repaid       279,000,000.0  
FHLB prepayment penalties       9,100,000  
Maximum borrowing capacity     3,000,000,000.0 3,900,000,000  
Federal Home Loan Bank Advances | Residential mortgage          
Debt Instrument [Line Items]          
Loans pledged as collateral     1,000,000,000.0 846,700,000  
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     226,200,000 231,100,000  
Federal Home Loan Bank Advances | Multifamily loans          
Debt Instrument [Line Items]          
Loans pledged as collateral     237,600,000 261,900,000  
Federal Reserve and correspondent banks          
Debt Instrument [Line Items]          
Maximum borrowing capacity     276,200,000 452,900,000  
Line of credit     0 0  
Unsecured lines of credit, correspondent banks          
Debt Instrument [Line Items]          
Maximum borrowing capacity     1,100,000,000 1,200,000,000  
Line of credit     390,000,000.0 0  
Subordinated Debt          
Debt Instrument [Line Items]          
Add: Purchase accounting premium     $ 1,669,000 1,433,000  
Subordinated Debt | Fixed Floating Rate Subordinated Notes          
Debt Instrument [Line Items]          
Long-term borrowings   $ 175,000,000.0      
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       $ 25,000,000.0  
Interest rate       4.75% 6.00%
Basis spread on variable rate     4.57%    
Add: Purchase accounting premium       $ 2,200,000  
Debt instrument, term       10 years  
Subordinated Debt | WashingtonFirst Bankshares Inc | Tier 2 Capital          
Debt Instrument [Line Items]          
Long-term borrowings       $ 20,000,000.0  
Subordinated Debt | Revere acquisition          
Debt Instrument [Line Items]          
Long-term borrowings $ 31,000,000.0        
Interest rate 5.625%     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 $ 140,700,000  
Federal Funds Purchased          
Debt Instrument [Line Items]          
Long-term debt     $ 390,000,000.0 0  
Federal funds under the PPPLF program          
Debt Instrument [Line Items]          
Long-term debt       0  
Remaining borrowing capacity       $ 897,200,000