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LOANS - Pledged Loans (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Unpaid principal balances $ 977,900,000,000 $ 1,140,000,000
Asset Pledged as Collateral | Federal Reserve Bank Advances    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Financing Receivable, Unpaid Principal Balance $ 84,200,000 $ 0