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BORROWINGS - Schedule of Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Debt Instrument [Line Items]    
Short-term Debt $ 1,626,933 $ 1,506,812
FHLB advances    
Debt Instrument [Line Items]    
Short-term Debt 1,456,933 1,281,812
Overnight borrowings    
Debt Instrument [Line Items]    
Short-term Debt 170,000 225,000
Overnight borrowings | Line of Credit    
Debt Instrument [Line Items]    
Short-term Debt $ 170,000 125,000
Overnight borrowings | Unsecured Debt    
Debt Instrument [Line Items]    
Short-term Debt   $ 100,000