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BORROWINGS - Schedule of Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Debt Instrument [Line Items]    
Short-term Debt $ 1,667,055 $ 1,506,812
Overnight borrowings    
Debt Instrument [Line Items]    
Short-term Debt 235,000 225,000
Overnight borrowings | Line of Credit    
Debt Instrument [Line Items]    
Short-term Debt 235,000 125,000
Overnight borrowings | Unsecured Debt    
Debt Instrument [Line Items]    
Short-term Debt   100,000
FHLB advances    
Debt Instrument [Line Items]    
Short-term Debt $ 1,432,055 $ 1,281,812