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Allowance for Losses on Loans - Activity in Allowance for Loan Losses by Loan Portfolio Segment and Class (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | $ 171,300 | $ 166,955
Charge-offs | (677) | (152)
Recoveries | 2,788 | 1,886
Provision & Transfers | (2,000) | 1,500
Ending Allowance | 171,411 | 170,189
Unfunded commitments |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision & Transfers | 2,500 | 1,500
Commercial loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 125,375 | 109,923
Charge-offs | (574) | (2)
Recoveries | 2,126 | 874
Provision & Transfers | 910 | 8,412
Ending Allowance | 127,837 | 119,207
Commercial loans | Multi-family |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 16,949 | 13,853
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | (956) | 510
Ending Allowance | 15,993 | 14,363
Commercial loans | Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 23,437 | 22,516
Charge-offs | (529) | 0
Recoveries | 44 | 789
Provision & Transfers | 2,770 | 191
Ending Allowance | 25,722 | 23,496
Commercial loans | Commercial & industrial |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 45,957 | 38,665
Charge-offs | (43) | (2)
Recoveries | 62 | 50
Provision & Transfers | 1,255 | 5,604
Ending Allowance | 47,231 | 44,317
Commercial loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 25,585 | 24,156
Charge-offs | 0 | 0
Recoveries | 2,000 | 0
Provision & Transfers | (2,819) | 2,209
Ending Allowance | 24,766 | 26,365
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 13,447 | 10,733
Charge-offs | (2) | 0
Recoveries | 20 | 35
Provision & Transfers | 660 | (102)
Ending Allowance | 14,125 | 10,666
Consumer loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 45,925 | 57,032
Charge-offs | (103) | (150)
Recoveries | 662 | 1,012
Provision & Transfers | (2,910) | (6,912)
Ending Allowance | 43,574 | 50,982
Consumer loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 4,907 | 3,555
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | (1,188) | 39
Ending Allowance | 3,719 | 3,594
Consumer loans | Single-family residential |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 30,978 | 45,186
Charge-offs | 0 | 0
Recoveries | 405 | 779
Provision & Transfers | (1,277) | (7,352)
Ending Allowance | 30,106 | 38,613
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 4,939 | 2,729
Charge-offs | (27) | 0
Recoveries | 5 | 7
Provision & Transfers | 67 | 222
Ending Allowance | 4,984 | 2,958
Consumer loans | HELOC |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,390 | 2,571
Charge-offs | 0 | 0
Recoveries | 1 | 0
Provision & Transfers | (26) | (209)
Ending Allowance | 2,365 | 2,362
Consumer loans | Consumer |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,711 | 2,991
Charge-offs | (76) | (150)
Recoveries | 251 | 226
Provision & Transfers | (486) | 388
Ending Allowance | $ 2,400 | $ 3,455

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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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