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INVESTMENT SECURITIES - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Investments [Line Items]          
Trading securities $ 0   $ 0    
Number of available for sale investment securities | security 986   986    
Number of available-for-sale securities unrealized loss position | security 953   953    
Weighted average duration of MBS portfolio     5 years 8 months 12 days    
Securities pledged as collateral $ 3,300,000,000   $ 3,300,000,000   $ 3,300,000,000
Sale of investment securities available-for-sale     0 $ 0  
Unamortized premiums 50,300,000   50,300,000   56,900,000
Unaccreted discounts 18,500,000   18,500,000   20,900,000
Allowance for credit losses 0   0   0
Held-to-maturity debt securities with an amortized cost basis 1,000,000,000.0   1,000,000,000.0   1,100,000,000
Accrued interest 3,100,000   3,100,000   3,700,000
Debt securities nonaccrual 0   0   0
Past due held-to-maturity debt securities 1,026,312,000   1,026,312,000   1,058,565,000
Fair value 17,000,000.0   17,000,000.0   17,400,000
Realized gain on sale of equity investments, net 56,000 $ 0 2,186,000 0  
Other Income          
Schedule of Investments [Line Items]          
Gain (loss) on sale of equity investments   $ 700,000   $ (1,000,000.0)  
Past Due          
Schedule of Investments [Line Items]          
Past due held-to-maturity debt securities $ 0   $ 0   $ 0