LOANS & ALLOWANCE FOR CREDIT LOSSES - UNPAID PRINCIPAL BALANCE FOR PERFORMING AND NONACCRUAL (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 19,316,962	$ 16,652,026
Nonaccrual loans to total loans	0.63%	0.52%
Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 4,122,726	$ 4,173,833
Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,001,056	3,082,225
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,912,988	6,199,818
Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,827,531	2,639,650
Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	450,765	546,264
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,896	10,236
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	19,194,882	16,564,866
Performing \| Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,071,384	4,143,119
Performing \| Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,962,591	3,047,122
Performing \| Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,886,886	6,184,966
Performing \| Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,823,511	2,636,661
Performing \| Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	448,614	544,807
Performing \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,896	8,191
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	122,080	87,160
Nonaccrual \| Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Total	51,342	30,714
Nonaccrual \| Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	38,465	35,103
Nonaccrual \| Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	26,102	14,852
Nonaccrual \| Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,020	2,989
Nonaccrual \| Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,151	1,457
Nonaccrual \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 0	$ 2,045

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481598/310-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

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