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LOANS & ALLOWANCE FOR CREDIT LOSSES - NARRATIVE (Details)		3 Months Ended		9 Months Ended
	Dec. 07, 2023 loanPortfolio	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Jun. 30, 2023 USD ($) loan
Financing Receivable, Impaired [Line Items]
Number of loan portfolio segments	2			6
Accrued interest receivable on loans held for investments		$ 103,300,000		$ 103,300,000		$ 77,900,000
Advances, collateral pledged		5,226,400,000		5,226,400,000		5,128,400,000
FRBSF and FRB, loans pledged		7,834,900,000		7,834,900,000		3,689,500,000
Nonaccrual loans		0		0		0
Interest income recognized on nonaccrual loans		0	$ 0	0	$ 0
Loans past due ninety days or more and still accruing		49,300,000		49,300,000		14,100,000
Mortgage loans in process of foreclosure, amount		$ 29,300,000		$ 29,300,000		$ 17,700,000
Nonaccrual
Financing Receivable, Impaired [Line Items]
Ratio of nonaccrual loans and leases considered TDRs						1.77%
Period over which borrowers can make timely payments after TDR considered non-performing (in months)				6 months
Performing
Financing Receivable, Impaired [Line Items]
Number or TDRs classified as performing | loan						0

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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