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BORROWINGS - Schedule of Borrowings (Details) - USD ($)
Dec. 31, 2024
Jun. 30, 2024
Debt Instrument [Line Items]    
Borrowings $ 1,258,949,000 $ 1,709,789,000
Overnight borrowings    
Debt Instrument [Line Items]    
Borrowings 230,000,000 175,000,000
FHLB advances    
Debt Instrument [Line Items]    
Borrowings 1,028,949,000 1,434,789,000
Federal Reserve Bank Term Funding Program ("BTFP") borrowings    
Debt Instrument [Line Items]    
Borrowings 0 100,000,000
Line of Credit | Overnight borrowings    
Debt Instrument [Line Items]    
Borrowings $ 230,000,000 $ 175,000,000