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Allowance for Losses on Loans - Internally Assigned Grade (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Mar. 31, 2024 | Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | $ 20,996,836 | $ 17,653,757
Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | $ 20,459,022 | 17,246,669
Pass | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 97.69% | 97.44% |
Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | $ 230,403 | 101,922
Special mention | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 0.58% | 1.10% |
Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | $ 307,411 | 305,166
Substandard | Accounts Receivable | Credit Concentration Risk |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total grade as a % of total loans | 1.73% | 1.47% |
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 |  | $ 11,717,725 | 10,507,610
Commercial loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 11,200,644 | 10,119,666
Commercial loans | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 230,403 | 101,922
Commercial loans | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 286,678 | 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 |  | 4,089,719 | 2,886,594
Commercial loans | Multi-family | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 3,944,926 | 2,772,538
Commercial loans | Multi-family | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 112,984 | 90,428
Commercial loans | Multi-family | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 31,809 | 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 |  | 3,544,884 | 3,310,101
Commercial loans | Commercial real estate | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 3,386,918 | 3,207,596
Commercial loans | Commercial real estate | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 42,394 | 4,847
Commercial loans | Commercial real estate | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 115,572 | 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 |  | 2,283,922 | 2,315,318
Commercial loans | Commercial & industrial | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 2,092,707 | 2,164,876
Commercial loans | Commercial & industrial | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 71,783 | 6,647
Commercial loans | Commercial & industrial | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 119,432 | 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 |  | 1,623,496 | 1,838,936
Commercial loans | Construction | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 1,600,992 | 1,818,266
Commercial loans | Construction | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 2,888 | 0
Commercial loans | Construction | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 19,616 | 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 |  | 175,704 | 156,661
Commercial loans | Land - acquisition & development | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 175,101 | 156,390
Commercial loans | Land - acquisition & development | Special mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 354 | 0
Commercial loans | Land - acquisition & development | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 249 | 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 |  | 9,279,111 | 7,146,147
Consumer loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 9,258,378 | 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 |  | 20,733 | 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 |  | 223,377 | 324,451
Consumer loans | Construction | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 223,290 | 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 |  | 87 | 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 |  | 8,619,916 | 6,388,990
Consumer loans | Single-family residential | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 8,599,901 | 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 |  | 20,015 | 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 |  | 114,256 | 124,842
Consumer loans | Land - consumer lot loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 114,256 | 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 |  | 0 | 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 |  | 247,305 | 237,754
Consumer loans | HELOC | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 246,814 | 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 |  | 491 | 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 |  | 74,257 | 70,110
Consumer loans | Consumer | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Gross loans |  | 74,117 | 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 |  | 140 | 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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