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SUBSEQUENT EVENTS (Details)
$ / shares in Units, shares in Millions, $ in Millions
Jul. 25, 2023
USD ($)
consecutive-tradingDay
tradingDays
$ / shares
shares
Mar. 31, 2023
USD ($)
Interest rate swaps    
Subsequent Event [Line Items]    
Aggregate notional amount | $   $ 300.0
Banc of California, NA | Subsequent Event    
Subsequent Event [Line Items]    
Contingent forward asset sale | $ $ 1,800.0  
Banc of California, NA | Subsequent Event | Interest rate swaps    
Subsequent Event [Line Items]    
Aggregate notional amount | $ 3,500.0  
Cost of hedged item | $ 15.7  
Warburg Pincus LLC (“Warburg”), and Centerbridge Partners, L.P. And Affiliates (“Centerbridge”) | Subsequent Event    
Subsequent Event [Line Items]    
Total investment expected | $ $ 400.0  
PacWest Agreement and Plan Of Merger | Subsequent Event | Common Stock    
Subsequent Event [Line Items]    
Shares issuable (in shares) | shares 21.8  
Purchase price per share (in usd per share) $ 12.30  
PacWest Agreement and Plan Of Merger | Subsequent Event | Common Stock | Non-Voting    
Subsequent Event [Line Items]    
Shares issuable (in shares) | shares 10.8  
Purchase price per share (in usd per share) $ 12.30  
PacWest Agreement and Plan Of Merger | PacWest | Subsequent Event    
Subsequent Event [Line Items]    
Share conversion rate at merger 0.6569  
PacWest Agreement and Plan Of Merger | PacWest | Subsequent Event | Noncumulative Preferred Stock    
Subsequent Event [Line Items]    
Share conversion rate at merger 1  
Non cumulative preferred stock, dividend rate (percent) 7.75%  
PacWest Agreement and Plan Of Merger | Warburg | Subsequent Event    
Subsequent Event [Line Items]    
Warrants to be issued (shares) | shares 15.9  
Exercise price of warrants for non-voting common stock (in dollars per share) $ 15.375  
Warrants and rights outstanding, term 7 years  
Common stock, share price (in dollars per share) $ 24.60  
Number of trading days | tradingDays 20  
Number of consecutive trading day period | consecutive-tradingDay 30  
PacWest Agreement and Plan Of Merger | Centerbridge | Subsequent Event    
Subsequent Event [Line Items]    
Warrants to be issued (shares) | shares 3.0  
Exercise price of warrants for non-voting common stock (in dollars per share) $ 15.375  
Warrants and rights outstanding, term 7 years  
Common stock, share price (in dollars per share) $ 24.60  
Number of trading days | tradingDays 20  
Number of consecutive trading day period | consecutive-tradingDay 30