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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 21,077,743 | $ 17,653,757
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 20,449,019 | $ 17,246,669
Pass | Accounts Receivable | Credit Concentration Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total grade as a % of total loans | 97.02% | 97.69%
Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 243,895 | $ 101,922
Special mention | Accounts Receivable | Credit Concentration Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total grade as a % of total loans | 1.16% | 0.58%
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 384,829 | $ 305,166
Substandard | Accounts Receivable | Credit Concentration Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total grade as a % of total loans | 1.84% | 1.73%
Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 0 | $ 0
Doubtful | Accounts Receivable | Credit Concentration Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total grade as a % of total loans | 0.00% | 0.00%
Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 0 | $ 0
Loss | Accounts Receivable | Credit Concentration Risk |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total grade as a % of total loans | 0.00% | 0.00%
Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 12,246,080 | $ 10,507,610
Commercial loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 11,639,097 | 10,119,666
Commercial loans | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 243,895 | 101,922
Commercial loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 363,088 | 286,022
Commercial loans | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 4,513,323 | 2,886,594
Commercial loans | Multi-family | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 4,357,741 | 2,772,538
Commercial loans | Multi-family | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 99,779 | 90,428
Commercial loans | Multi-family | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 55,803 | 23,628
Commercial loans | Multi-family | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Multi-family | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 3,746,945 | 3,310,101
Commercial loans | Commercial real estate | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 3,597,165 | 3,207,596
Commercial loans | Commercial real estate | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 42,206 | 4,847
Commercial loans | Commercial real estate | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 107,574 | 97,658
Commercial loans | Commercial real estate | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Commercial real estate | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,389,236 | 2,315,318
Commercial loans | Commercial & industrial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,116,078 | 2,164,876
Commercial loans | Commercial & industrial | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 90,382 | 6,647
Commercial loans | Commercial & industrial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 182,776 | 143,795
Commercial loans | Commercial & industrial | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Commercial & industrial | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,440,152 | 1,838,936
Commercial loans | Construction | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,412,102 | 1,818,266
Commercial loans | Construction | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 11,189 | 0
Commercial loans | Construction | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 16,861 | 20,670
Commercial loans | Construction | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Construction | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 156,424 | 156,661
Commercial loans | Land - acquisition & development | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 156,011 | 156,390
Commercial loans | Land - acquisition & development | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 339 | 0
Commercial loans | Land - acquisition & development | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 74 | 271
Commercial loans | Land - acquisition & development | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial loans | Land - acquisition & development | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 8,831,663 | 7,146,147
Consumer loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 8,809,922 | 7,127,003
Consumer loans | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 21,741 | 19,144
Consumer loans | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 190,433 | 324,451
Consumer loans | Construction | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 190,345 | 324,363
Consumer loans | Construction | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Construction | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 88 | 88
Consumer loans | Construction | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Construction | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 8,186,361 | 6,388,990
Consumer loans | Single-family residential | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 8,165,936 | 6,370,936
Consumer loans | Single-family residential | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Single-family residential | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 20,425 | 18,054
Consumer loans | Single-family residential | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Single-family residential | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 111,574 | 124,842
Consumer loans | Land - consumer lot loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 111,125 | 124,588
Consumer loans | Land - consumer lot loans | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Land - consumer lot loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 449 | 254
Consumer loans | Land - consumer lot loans | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Land - consumer lot loans | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 258,833 | 237,754
Consumer loans | HELOC | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 258,075 | 237,018
Consumer loans | HELOC | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | HELOC | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 758 | 736
Consumer loans | HELOC | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | HELOC | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 84,462 | 70,110
Consumer loans | Consumer | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 84,441 | 70,098
Consumer loans | Consumer | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Consumer | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 21 | 12
Consumer loans | Consumer | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Consumer loans | Consumer | Loss |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 0 | $ 0

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