LOANS & ALLOWANCE FOR CREDIT LOSSES - SCHEDULE OF COMPOSITION OF LOAN PORTFOLIO (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Sep. 30, 2025	Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 26,358,461	$ 26,096,037
Allowance for credit losses - loans	(304,361)	(347,375)	$ (307,431)	$ (290,049)
Unaccreted premiums (discounts) and loan fees	(142,076)	(153,259)
Total net loans	25,912,024	25,595,403
Single Family - Mortgage & Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	4,446,687	4,581,772
Allowance for credit losses - loans	(6,905)	(7,356)	(10,171)	(12,109)
Multifamily and Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,373,026	2,484,290
Allowance for credit losses - loans	(20,438)	(21,104)	(21,283)	(26,238)
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	9,657,946	8,867,851
Allowance for credit losses - loans	(117,691)	(121,552)	(120,349)	(113,804)
Commercial & Industrial - Non-RE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	9,160,723	9,495,647
Allowance for credit losses - loans	(137,084)	(177,084)	(138,037)	(121,641)
Auto & Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	720,079	666,477
Allowance for credit losses - loans	$ (22,243)	$ (20,279)	$ (17,591)	$ (16,257)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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