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BORROWINGS - Schedule of Borrowings (Details) - USD ($)	Mar. 31, 2025	Jun. 30, 2024
Debt Instrument [Line Items]
Borrowings	$ 1,213,976,000	$ 1,709,789,000
Overnight borrowings
Debt Instrument [Line Items]
Borrowings	185,000,000	175,000,000
FHLB advances
Debt Instrument [Line Items]
Borrowings	1,028,976,000	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 | FHLB Overnight Line of Credit Borrowings
Debt Instrument [Line Items]
Borrowings	$ 185,000,000	$ 175,000,000

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