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Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | $ 166,955 | $ 131,534
Charge-offs | (425) | (5,755)
Recoveries | 6,770 | 9,026
Provision & Transfers | (2,000) | 14,400
Ending allowance | 171,300 | 166,955
Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 166,955 |
Ending allowance |  | 166,955
Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 17,750
Commercial loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 109,923 | 93,470
Charge-offs | (33) | (4,318)
Recoveries | 3,503 | 5,646
Provision & Transfers | 11,982 | 19,260
Ending allowance | 125,375 | 109,923
Commercial loans | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 109,923 |
Ending allowance |  | 109,923
Commercial loans | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | (4,135)
Commercial loans | Multi-family |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 13,853 | 7,391
Charge-offs | 0 | 0
Recoveries | 0 | 498
Provision & Transfers | 3,096 | 2,951
Ending allowance | 16,949 | 13,853
Commercial loans | Multi-family | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 13,853 |
Ending allowance |  | 13,853
Commercial loans | Multi-family | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 3,013
Commercial loans | Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 22,516 | 13,170
Charge-offs | 0 | (111)
Recoveries | 2,789 | 2,447
Provision & Transfers | (1,868) | 7,156
Ending allowance | 23,437 | 22,516
Commercial loans | Commercial real estate | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 22,516 |
Ending allowance |  | 22,516
Commercial loans | Commercial real estate | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | (146)
Commercial loans | Commercial & industrial |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 38,665 | 31,450
Charge-offs | (31) | (4,196)
Recoveries | 92 | 443
Provision & Transfers | 7,231 | 10,183
Ending allowance | 45,957 | 38,665
Commercial loans | Commercial & industrial | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 38,665 |
Ending allowance |  | 38,665
Commercial loans | Commercial & industrial | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 785
Commercial loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 24,156 | 32,304
Charge-offs | 0 | 0
Recoveries | 0 | 188
Provision & Transfers | 1,429 | 1,200
Ending allowance | 25,585 | 24,156
Commercial loans | Construction | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 24,156 |
Ending allowance |  | 24,156
Commercial loans | Construction | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | (9,536)
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 10,733 | 9,155
Charge-offs | (2) | (11)
Recoveries | 622 | 2,070
Provision & Transfers | 2,094 | (2,230)
Ending allowance | 13,447 | 10,733
Commercial loans | Land - acquisition & development | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 10,733 |
Ending allowance |  | 10,733
Commercial loans | Land - acquisition & development | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 1,749
Consumer loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 57,032 | 38,064
Charge-offs | (392) | (1,437)
Recoveries | 3,267 | 3,380
Provision & Transfers | (13,982) | (4,860)
Ending allowance | 45,925 | 57,032
Consumer loans | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 57,032 |
Ending allowance |  | 57,032
Consumer loans | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 21,885
Consumer loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 3,555 | 1,369
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | 1,352 | 675
Ending allowance | 4,907 | 3,555
Consumer loans | Construction | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 3,555 |
Ending allowance |  | 3,555
Consumer loans | Construction | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 1,511
Consumer loans | Single-family residential |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 45,186 | 30,988
Charge-offs | (106) | (131)
Recoveries | 2,026 | 1,394
Provision & Transfers | (16,128) | (3,848)
Ending allowance | 30,978 | 45,186
Consumer loans | Single-family residential | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 45,186 |
Ending allowance |  | 45,186
Consumer loans | Single-family residential | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 16,783
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 2,729 | 2,143
Charge-offs | 0 | (237)
Recoveries | 168 | 639
Provision & Transfers | 2,042 | (308)
Ending allowance | 4,939 | 2,729
Consumer loans | Land - consumer lot loans | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 2,729 |
Ending allowance |  | 2,729
Consumer loans | Land - consumer lot loans | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 492
Consumer loans | HELOC |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 2,571 | 1,103
Charge-offs | 0 | 0
Recoveries | 52 | 95
Provision & Transfers | (233) | 428
Ending allowance | 2,390 | 2,571
Consumer loans | HELOC | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 2,571 |
Ending allowance |  | 2,571
Consumer loans | HELOC | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | 945
Consumer loans | Consumer |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | 2,991 | 2,461
Charge-offs | (286) | (1,069)
Recoveries | 1,021 | 1,252
Provision & Transfers | (1,015) | (1,807)
Ending allowance | 2,711 | 2,991
Consumer loans | Consumer | Adjusted |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance | $ 2,991 |
Ending allowance |  | 2,991
Consumer loans | Consumer | Impact of ASC 326 Adoption |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance |  | $ 2,154

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