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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 ($)
Dec. 31, 2021
USD ($)
correspondent_bank
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2021
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
Repayments of FHLB advances   $ 0 $ 335,000,000 $ 125,000,000  
Weighted average interest rate (percent)   0.20% 0.17%    
Overnight borrowings   $ 70,000,000      
Borrowings maturing beyond six months   $ 411,000,000      
Weighted average life   4 years      
Average interest rate (percent)   2.53%      
Advances from FHLB collateralized   $ 2,340,000,000      
Unamortized debt issuance costs   4,900,000 $ 6,200,000    
Investment in capital stock of the federal reserve   $ 27,300,000 27,300,000    
Number of correspondent banks | correspondent_bank   5      
Available capacity   $ 441,000,000 196,000,000    
Other borrowings, net   25,000,000 0    
Securities sold under repurchase agreements   0 0    
Revolving Credit Facility          
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
Amount of available line of credit with Federal Reserve Bank   $ 50,000,000      
Line of credit facility, commitment fee percentage   0.40%      
Line of credit facility, current borrowing capacity   $ 0      
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)          
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
Basis spread on variable rate (percent)   1.75%      
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   $ 455,400,000      
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        
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        
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   210,000,000      
Other borrowings   0      
Collateralized loan obligations | Federal Reserve Bank Advances          
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
Advances from FHLB collateralized   813,800,000      
Collateral on line of credit facility   8,900,000      
Federal Home Loan Bank of San Francisco          
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
Secured borrowing capacity from FHLB   1,840,000,000      
Amount of additional available borrowing   1,060,000,000.00      
FHLB stock   $ 17,300,000 $ 17,300,000