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Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	$ 177,207	$ 172,808
Charge-offs	(3,625)	(46,470)
Recoveries	2,269	1,369
Provision & Transfers	(27,902)	(49,500)
Ending Allowance	203,753	177,207
Non-PCD
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision & Transfers	(16,000)
PCD | Luther Burbank
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision & Transfers	(7,403)
Unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision & Transfers	3,000	(8,000)
Commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	137,194	133,476
Charge-offs	(2,963)	(45,856)
Recoveries	1,178	274
Provision & Transfers	(17,964)	(49,300)
Ending Allowance	153,373	137,194
Commercial loans | Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	13,155	12,013
Charge-offs	0	0
Recoveries	0	0
Provision & Transfers	(12,093)	(1,142)
Ending Allowance	25,248	13,155
Commercial loans | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	28,842	25,814
Charge-offs	(203)	0
Recoveries	4	103
Provision & Transfers	(10,567)	(2,925)
Ending Allowance	39,210	28,842
Commercial loans | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	58,773	57,210
Charge-offs	(2,611)	(45,856)
Recoveries	1,069	93
Provision & Transfers	(1,517)	(47,326)
Ending Allowance	58,748	58,773
Commercial loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	29,408	26,161
Charge-offs	0	0
Recoveries	0	0
Provision & Transfers	7,141	(3,247)
Ending Allowance	22,267	29,408
Commercial loans | Land - acquisition & development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	7,016	12,278
Charge-offs	(149)	0
Recoveries	105	78
Provision & Transfers	(928)	5,340
Ending Allowance	7,900	7,016
Consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	40,013	39,332
Charge-offs	(662)	(614)
Recoveries	1,091	1,095
Provision & Transfers	(9,938)	(200)
Ending Allowance	50,380	40,013
Consumer loans | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	2,781	3,410
Charge-offs	0	0
Recoveries	1	0
Provision & Transfers	1,355	629
Ending Allowance	1,427	2,781
Consumer loans | Single-family residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	28,029	25,518
Charge-offs	(144)	(34)
Recoveries	381	568
Provision & Transfers	(12,257)	(1,977)
Ending Allowance	40,523	28,029
Consumer loans | Land - consumer lot loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	3,512	5,047
Charge-offs	0	0
Recoveries	58	23
Provision & Transfers	1,006	1,558
Ending Allowance	2,564	3,512
Consumer loans | HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	2,859	2,482
Charge-offs	0	0
Recoveries	4	2
Provision & Transfers	(186)	(375)
Ending Allowance	3,049	2,859
Consumer loans | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Allowance	2,832	2,875
Charge-offs	(518)	(580)
Recoveries	647	502
Provision & Transfers	144	(35)
Ending Allowance	$ 2,817	$ 2,832

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

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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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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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-Topic 326
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-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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