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ACQUISITIONS - NARRATIVE (Details) $ in Thousands			12 Months Ended
	Dec. 07, 2023 USD ($) loanPortfolio	Aug. 23, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Business Acquisition [Line Items]
Number of loan portfolio segments	2		5
Unpaid principal balance			$ 19,231,385	$ 16,456,728
Allowance for credit losses at acquisition			260,542	166,680	$ 148,617	$ 132,958
Gain on acquisition			92,397	0	0
Commercial Real Estate
Business Acquisition [Line Items]
Allowance for credit losses at acquisition			$ 87,780	$ 72,755	$ 69,339	$ 57,928
Marine Floor Financing Loans
Business Acquisition [Line Items]
Consideration transferred		$ 52,000
Intangible And Other Assets
Business Acquisition [Line Items]
Consideration transferred		$ 2,000
Real Estate Loan Portfolios | Commercial Real Estate
Business Acquisition [Line Items]
Unpaid principal balance	$ 1,300,000
Unpaid principal balance, fair value	901,500
Non-credit-related discount	306,800
Gain on acquisition	92,400
Real Estate Loan Portfolios | Commercial Real Estate | Interest Rate Swap
Business Acquisition [Line Items]
Other assets	109,000
Accounts payable and other liabilities—Derivative instruments	104,400
Real Estate Loan Portfolios | PCD Portfolio Segment
Business Acquisition [Line Items]
Unpaid principal balance	341,301
Non-credit-related discount	100,686
Allowance for credit losses at acquisition	$ 70,097

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481598/310-20-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

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