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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Detail)
3 Months Ended
Mar. 31, 2021
USD ($)
correspondent_bank
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Repayment of FHLB advances $ 0 $ 24,000,000  
Weighted average interest rate (percent) 0.09%   0.17%
Overnight borrowings $ 225,000,000.0    
Advances maturing within three months 5,000,000.0    
Advances maturing beyond three months $ 411,000,000.0    
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)   2.53%  
Advances from FHLB collateralized $ 2,230,000,000   $ 2,370,000,000
Unsecured borrowings 231,000,000.0   196,000,000.0
Securities sold under repurchase agreements 0   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 175,000,000.0    
Other borrowings $ 0    
Number of correspondent banks | correspondent_bank 4    
Federal Reserve Bank Advances      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Line of credit facility $ 384,900,000    
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 745,300,000    
Collateral on line of credit facility 23,900,000    
Federal Home Loan Bank of San Francisco      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Amount of additional available borrowing 584,200,000    
FHLB stock $ 17,700,000   $ 17,300,000