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FEDERAL HOME LOAN BANK ADVANCES AND SHORT-TERM BORROWINGS - Additional Information (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
correspondent_bank
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Repayments of FHLB advances   $ 335,000,000 $ 125,000,000 $ 125,000,000
FHLB variable-rate, weighted average interest rate (percent)   0.17% 1.66%  
Overnight borrowings   $ 85,000,000.0    
Borrowings maturing within six months   50,000,000.0    
Borrowings maturing beyond six months   $ 411,000,000.0    
Weighted average life   5 years    
Average interest rate (percent)   2.53%    
Advances from FHLB collateralized   $ 2,370,000,000 $ 3,050,000,000.00  
Unamortized debt issuance costs   6,200,000    
Securities sold under repurchase agreements   0 0  
Unsecured debt   196,000,000.0    
Federal Reserve Bank Advances        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Amount of available line of credit with Federal Reserve Bank   422,400,000    
Other borrowings   0 0  
FHLB Advance Repaid June 2020        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Repayments of FHLB advances $ 100,000,000.0      
FHLB variable-rate, 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 term 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]        
Amount of available line of credit with Federal Reserve Bank   185,000,000.0    
Other borrowings   $ 0    
Number of correspondent banks | correspondent_bank   5    
Collateralized loan obligations | Federal Reserve Bank Advances        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Advances from FHLB collateralized   $ 856,200,000    
Collateral on line of credit facility   23,700,000    
Federal Home Loan Bank of San Francisco        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Amount of additional available borrowing   821,700,000    
FHLB stock   $ 17,300,000 $ 32,300,000