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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 9 Months Ended
May 20, 2025
$ / shares
shares
Mar. 01, 2025
$ / shares
shares
Apr. 01, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
shares
Dec. 31, 2024
USD ($)
shares
Sep. 30, 2024
USD ($)
Debt Instrument [Line Items]            
Total assets | $       $ 18,188,628,000 $ 12,046,722,000  
Preferred stock phares per depository share (in dollars per share) | $ / shares $ 0.025          
Number of reportable segments | segment       3    
Number of operating segments | segment       3    
Income tax examination, penalties and interest accrued | $       $ 100,000    
Accruals for payments of interest and penalties | $       $ 0   $ 0
Preferred shares issued (in shares) | shares       222,750 0  
Preferred stock redemption price per share (in dollars per share) | $ / shares   $ 1,000        
M&M | 5.25% Notes Maturing December 4, 2030 | Subordinated Debt            
Debt Instrument [Line Items]            
Principal balance | $     $ 4,000,000      
Fixed to floating interest rate (as a percent)     5.25%      
Series A Preferred Stock            
Debt Instrument [Line Items]            
Preferred shares issued (in shares) | shares   7,750        
Preferred stock, dividend rate   8.00%        
Preferred stock, liquidation preference (in dollars per share) | $ / shares   $ 1,000        
Preferred stock redemption price per share (in dollars per share) | $ / shares   $ 1,000        
Depository Shares            
Debt Instrument [Line Items]            
Preferred stock, liquidation preference (in dollars per share) | $ / shares $ 25          
Stock issued depositary shares (in shares) | shares 8,600,000          
Series B Preferred Stock            
Debt Instrument [Line Items]            
Preferred stock, liquidation preference (in dollars per share) | $ / shares $ 1,000          
Preferred stock redemption price per share (in dollars per share) | $ / shares $ 1,000          
Derivative | Collateral Pledged            
Debt Instrument [Line Items]            
Restricted cash and cash equivalents | $       $ 14,400,000    
Third-Party Service Provider            
Debt Instrument [Line Items]            
Restricted cash and cash equivalents | $       13,600,000    
Federal Reserve Bank            
Debt Instrument [Line Items]            
Restricted cash and cash equivalents | $       $ 68,100,000