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FEDERAL HOME LOAN BANK ADVANCES, FEDERAL RESERVE BANK BORROWINGS AND OTHER BORROWINGS - Additional Information (Details)
3 Months Ended 9 Months Ended
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
bank
Dec. 31, 2022
USD ($)
bank
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Line of credit facility   $ 185,800,000 $ 0
Investment in capital stock of the federal reserve   $ 34,600,000 $ 34,500,000
Number of correspondent banks | bank   6 6
Other borrowings   $ 185,802,000 $ 0
Securities sold under repurchase agreements   0 0
Revolving Credit Facility      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Line of credit facility     50,000,000
Other borrowings   0 0
Unsecured Federal Funds Line of Credit | Line of Credit      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Line of credit facility   290,000,000 210,000,000
Borrowings outstanding   0 0
Federal Reserve Bank Advances      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Line of credit facility   $ 1,380,000,000  
Federal Reserve Bank Advances | BTFP Program      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Term of borrowings under the program   1 year  
Spread on variable rate (percent)   0.10%  
Borrowings outstanding   $ 0  
Federal Reserve Bank Advances | FRB Discount Window and BIC Programs      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Borrowings during the period $ 0 200,000,000  
Borrowings outstanding   200,000,000 0
Federal Reserve Bank Advances | Collateralized loan obligations      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Advances from FHLB collateralized   1,280,000,000  
Collateral on line of credit facility   505,800,000  
Federal Home Loan Bank of San Francisco      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB stock   25,700,000 $ 22,600,000
Federal Home Loan Bank of San Francisco | Real Estate Loans      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Secured borrowing capacity from FHLB   2,420,000,000  
Amount of additional available borrowing   1,190,000,000  
Advances from FHLB collateralized   3,630,000,000  
Term Advances      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB advances   $ 611,000,000  
Weighted average life   2 years 9 months  
Weighted average interest rate (percent)   2.91%  
Putable Advances      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB advances   $ 200,000,000  
Weighted average life   4 years 3 months  
Weighted average interest rate (percent)   3.44%