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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended 9 Months Ended
Jul. 25, 2023
USD ($)
consecutive-tradingDay
tradingDay
$ / shares
shares
Sep. 30, 2023
USD ($)
branch
office
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
branch
office
Sep. 30, 2022
USD ($)
Nov. 09, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]                  
Number of offices | office   32     32        
Number of banking offices | branch   26     26        
Change in fair value of derivative instruments   $ 46,186 $ 10 $ 39 $ 46,172 $ 224      
Derivatives asset, notional amount   5,233,632     5,233,632       $ 39,579
Banc of California, NA                  
Business Acquisition [Line Items]                  
Contingent forward asset sale $ 1,800,000                
Interest rate swaps                  
Business Acquisition [Line Items]                  
Notional amount               $ 300,000  
Derivatives asset, notional amount 3,100,000                
Interest rate swaps | Banc of California, NA                  
Business Acquisition [Line Items]                  
Notional amount 3,100,000                
Cost of hedged item 15,700                
Change in fair value of derivative instruments   46,200              
Contingent forward loan sale agreement                  
Business Acquisition [Line Items]                  
Change in fair value of derivative instruments   34,900     34,900        
Derivatives asset, notional amount $ 1,800,000 $ 1,803,869     $ 1,803,869       $ 0
Common Stock                  
Business Acquisition [Line Items]                  
Number of shares issued in transaction (in shares) | shares 21.8                
Closing price of BOC's common stock (in USD per share) | $ / shares $ 12.30                
Non-Voting | Common Stock                  
Business Acquisition [Line Items]                  
Number of shares issued in transaction (in shares) | shares 10.8                
Closing price of BOC's common stock (in USD per share) | $ / shares $ 12.30                
Subsequent Event | Banc of California, NA                  
Business Acquisition [Line Items]                  
Contingent forward asset sale             $ 1,800,000    
PacWest Agreement and Plan Of Merger                  
Business Acquisition [Line Items]                  
Share conversion rate at merger 0.6569                
PacWest Agreement and Plan Of Merger | Noncumulative Preferred Stock                  
Business Acquisition [Line Items]                  
Share conversion rate at merger 1                
Non cumulative preferred stock, dividend rate (percent) 7.75%                
Warburg Pincus LLC (“Warburg”), and Centerbridge Partners, L.P. And Affiliates (“Centerbridge”)                  
Business Acquisition [Line Items]                  
Total investment expected $ 400,000                
Warburg                  
Business Acquisition [Line Items]                  
Warrants to be issued (shares) | shares 15.9                
Warrants and rights outstanding, term 7 years                
Common stock, share price (in dollars per share) | $ / shares $ 24.60                
Number of trading days | tradingDay 20                
Number of consecutive trading day period | consecutive-tradingDay 30                
Centerbridge                  
Business Acquisition [Line Items]                  
Warrants issued (in shares) | shares 3.0                
Exercise price of warrants for non-voting common stock (in dollars per share) | $ / shares $ 15.375                
Warrants and rights outstanding, term 7 years                
Common stock, share price (in dollars per share) | $ / shares $ 24.60                
Number of trading days | tradingDay 20                
Number of consecutive trading day period | consecutive-tradingDay 30