DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Pre-tax Effects of Derivative Instruments on Consolidated Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Derivative [Line Items]
Amount of gain (loss) recognized in other comprehensive income	$ 5,842	$ (3,987)	$ 6,602	$ (5,759)
Amount of gain reclassified from accumulated other comprehensive income to interest expense	39,933	45,292	127,420	144,971
Interest Rate Contract \| Reclassification out of Accumulated Other Comprehensive Income \| Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative [Line Items]
Amount of gain reclassified from accumulated other comprehensive income to interest expense	2,914	5,305	12,394	21,042
Amount of gain (loss) reclassified from accumulated other comprehensive income to interest income	$ 61	$ 162	$ 176	$ (209)

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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+ Details