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ALLOWANCE FOR LOAN LOSSES - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	$ 203,753	$ 177,207
Charge-offs	(13,170)	(3,625)
Recoveries	1,387	2,269
Provision & Transfers	7,750	27,902
Ending Allowance	199,720	203,753
Provision (recapture)	7,750	27,902
Non-PCD
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision & Transfers		16,000
Provision (recapture)		16,000
PCD | Luther Burbank
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision & Transfers		7,403
Provision (recapture)		7,403
Unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision & Transfers		(3,000)
Provision (recapture)		(3,000)
Commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	153,373	137,194
Charge-offs	(11,498)	(2,963)
Recoveries	454	1,178
Provision & Transfers	9,805	17,964
Ending Allowance	152,134	153,373
Provision (recapture)	9,805	17,964
Commercial loans | Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	25,248	13,155
Charge-offs	(555)	0
Recoveries	0	0
Provision & Transfers	1,260	12,093
Ending Allowance	25,953	25,248
Provision (recapture)	1,260	12,093
Commercial loans | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	39,210	28,842
Charge-offs	(9,652)	(203)
Recoveries	169	4
Provision & Transfers	12,261	10,567
Ending Allowance	41,988	39,210
Provision (recapture)	12,261	10,567
Commercial loans | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	58,748	58,773
Charge-offs	(1,291)	(2,611)
Recoveries	252	1,069
Provision & Transfers	1,454	1,517
Ending Allowance	59,163	58,748
Provision (recapture)	1,454	1,517
Commercial loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	22,267	29,408
Charge-offs	0	0
Recoveries	0	0
Provision & Transfers	(4,131)	(7,141)
Ending Allowance	18,136	22,267
Provision (recapture)	(4,131)	(7,141)
Commercial loans | Land - acquisition & development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	7,900	7,016
Charge-offs	0	(149)
Recoveries	33	105
Provision & Transfers	(1,039)	928
Ending Allowance	6,894	7,900
Provision (recapture)	(1,039)	928
Consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	50,380	40,013
Charge-offs	(1,672)	(662)
Recoveries	933	1,091
Provision & Transfers	(2,055)	9,938
Ending Allowance	47,586	50,380
Provision (recapture)	(2,055)	9,938
Consumer loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	1,427	2,781
Charge-offs	0	0
Recoveries	4	1
Provision & Transfers	(821)	(1,355)
Ending Allowance	610	1,427
Provision (recapture)	(821)	(1,355)
Consumer loans | Single-family residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	40,523	28,029
Charge-offs	(338)	(144)
Recoveries	572	381
Provision & Transfers	(1,877)	12,257
Ending Allowance	38,880	40,523
Provision (recapture)	(1,877)	12,257
Consumer loans | Land - consumer lot loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	2,564	3,512
Charge-offs	0	0
Recoveries	0	58
Provision & Transfers	(460)	(1,006)
Ending Allowance	2,104	2,564
Provision (recapture)	(460)	(1,006)
Consumer loans | HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	3,049	2,859
Charge-offs	0	0
Recoveries	3	4
Provision & Transfers	17	186
Ending Allowance	3,069	3,049
Provision (recapture)	17	186
Consumer loans | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	2,817	2,832
Charge-offs	(1,334)	(518)
Recoveries	354	647
Provision & Transfers	1,086	(144)
Ending Allowance	2,923	2,817
Provision (recapture)	$ 1,086	$ (144)

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on 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, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
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-Paragraph 6
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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