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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Detail)
1 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
correspondent_bank
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Repayment of FHLB advances   $ 235,000,000 $ 25,000,000  
Weighted average interest rate (percent)   0.00%   1.66%
Overnight borrowings   $ 0    
Advances maturing within three months   105,000,000.0    
Advances maturing beyond three months   461,000,000.0    
Weighted average life of advances maturing within three months and beyond three months 4 years 8 months 12 days      
Weighted average interest rate advances maturing within three months and beyond three months (percent) 2.51%      
Advances from FHLB collateralized   2,410,000,000   $ 3,050,000,000.00
Securities sold under repurchase agreements   $ 0   0
FHLB Advance Repaid June 2020        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Repayment of FHLB advances $ 100,000,000.0      
Weighted average interest rate (percent)   2.07%    
Extinguishment fee 2,500,000      
FHLB Advance Refinanced June 2020        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
FHLB advances refinanced $ 111,000,000.0      
Line of Credit | Unsecured Federal Funds Line of Credit        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Line of credit facility   $ 185,000,000.0    
Other borrowings   $ 0    
Number of correspondent banks | correspondent_bank   5    
Federal Reserve Bank Advances        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Line of credit facility   $ 427,700,000    
Other borrowings   0 $ 0  
Federal Reserve Bank Advances | Collateralized loan obligations        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Advances from FHLB collateralized   879,900,000    
Collateral on line of credit facility   23,500,000    
Federal Home Loan Bank of San Francisco        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Amount of additional available borrowing   890,000,000.0    
FHLB stock   $ 17,600,000   $ 32,300,000