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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

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- 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 + Details
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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 + Details
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