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DEBT SECURITIES - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 01, 2022
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]                    
Debt securities, available-for-sale and held to maturity, accrued interest, after allowance for credit loss   $ 19,600,000     $ 19,600,000     $ 15,900,000    
Debt securities, available-for-sale, accrued interest, after allowance for credit loss   17,400,000     17,400,000     13,600,000    
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss   2,200,000     2,200,000     2,400,000    
Trading securities   50,357,000     50,357,000     0    
Trading gains (losses) recorded in servicing income   98,000 $ 0   98,000 $ 0        
Debt securities, available-for-sale, sold at par value       $ 1,800,000,000            
Realized loss on AFS securities   0 0 207,200,000 923,000 207,203,000        
Purchases       1,600,000,000 561,139,000 2,154,513,000        
Realized gains on AFS securities   155,000 0 $ 0 5,215,000 0        
Tax exempt interest income on available-for-sale securities   1,900,000 776,000   3,400,000 2,400,000        
Equity   2,774,134,000 2,299,264,000   2,774,134,000 2,299,264,000 $ 2,416,617,000 2,301,868,000 $ 2,244,042,000 $ 2,235,605,000
Unrealized loss accreted to interest income   627,000 648,000   1,900,000 1,900,000        
Debt securities, available-for-sale, transfer to held-to-maturity, gain (loss)   0     0          
Allowance for credit loss on debt securities, available-for-sale   0     0          
Allowance for credit loss on debt securities, held-to-maturity               0    
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase                    
Debt Securities, Available-for-sale [Line Items]                    
Public funds included in deposits, pledged collateral, amount   1,500,000,000     1,500,000,000          
Asset Pledged as Collateral | Federal Reserve Bank Advances | Equity Securities                    
Debt Securities, Available-for-sale [Line Items]                    
Public funds included in deposits, pledged collateral, amount               3,000,000,000.0    
Securities                    
Debt Securities, Available-for-sale [Line Items]                    
Equity   (13,305,000) $ (18,472,000)   (13,305,000) $ (18,472,000) $ (35,945,000) (64,058,000) $ (63,768,000) $ (199,625,000)
Residential and Commercial Portfolio Segment | Residential and Commercial Mortgage                    
Debt Securities, Available-for-sale [Line Items]                    
Transfers of securities securities available-for-sale to held-to-maturity $ 1,700,000,000                  
Residential and Commercial Portfolio Segment | Residential and Commercial Mortgage | Securities                    
Debt Securities, Available-for-sale [Line Items]                    
Other comprehensive income, amount remaining of debt securities available for sale transfer to held to maturity, before tax 23,500,000                  
Other comprehensive income, amount remaining of debt securities available for sale transfer to held to maturity, net of deferred taxes $ 16,700,000                  
US Treasury Notes Securities                    
Debt Securities, Available-for-sale [Line Items]                    
Trading securities   $ 50,400,000     $ 50,400,000          
US Treasury Notes Securities | Designated as Hedging Instrument                    
Debt Securities, Available-for-sale [Line Items]                    
Trading securities               $ 0