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BORROWINGS - Narrative (Detail) - USD ($)
3 Months Ended
Apr. 01, 2020
Nov. 05, 2019
Mar. 31, 2021
Dec. 31, 2020
Oct. 05, 2020
Debt Instrument [Line Items]          
Long-term borrowings     $ 227,044,000 $ 227,088,000  
Long-term debt     516,362,000 1,149,320,000  
FHLB advances     100,000,000.0 379,100,000  
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 3,000,000,000.0  
Federal Home Loan Bank Advances | Residential mortgage          
Debt Instrument [Line Items]          
Loans pledged as collateral     897,800,000 1,000,000,000.0  
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     230,500,000 226,200,000  
Federal Home Loan Bank Advances | Multifamily loans          
Debt Instrument [Line Items]          
Loans pledged as collateral     259,400,000 237,600,000  
Federal Reserve and correspondent banks          
Debt Instrument [Line Items]          
Maximum borrowing capacity     420,400,000 276,200,000  
Line of credit     0 0  
Unsecured lines of credit, correspondent banks          
Debt Instrument [Line Items]          
Maximum borrowing capacity     1,100,000,000 1,100,000,000  
Line of credit     60,000,000.0 390,000,000.0  
Subordinated Debt          
Debt Instrument [Line Items]          
Add: Purchase accounting premium     1,552,000 $ 1,669,000  
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     4.81%   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     $ 129,300,000 $ 153,200,000  
Federal Funds Purchased          
Debt Instrument [Line Items]          
Long-term debt     60,000,000.0 $ 390,000,000.0  
Federal funds under the PPPLF program          
Debt Instrument [Line Items]          
Long-term debt     0    
Remaining borrowing capacity     $ 1,300,000,000