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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | $ 171,384 | $ 172,653 | $ 171,300 | $ 166,955
Charge-offs | (281) | (47) | (1,870) | (407)
Recoveries | 876 | 1,178 | 5,049 | 5,736
Provision & Transfers | 1,500 | (2,000) | 1,500 | 1,000
Ending Allowance | 170,979 | 170,784 | 170,979 | 170,784
Provisions & Transfers | (1,000) | (3,000) | (3,500) | (1,500)
Unfunded commitments |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provisions & Transfers | 2,500 | 1,000 | 5,000 | 2,500
Commercial loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 129,440 | 125,444 | 125,375 | 109,923
Charge-offs | (28) | (11) | (1,475) | (31)
Recoveries | 42 | 507 | 3,122 | 3,259
Ending Allowance | 130,859 | 123,519 | 130,859 | 123,519
Provisions & Transfers | 1,405 | (2,421) | 3,837 | 10,368
Commercial loans | Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 14,463 | 17,776 | 16,949 | 13,853
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Ending Allowance | 12,574 | 17,668 | 12,574 | 17,668
Provisions & Transfers | (1,889) | (108) | (4,375) | 3,815
Commercial loans | Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 24,682 | 26,822 | 23,437 | 22,516
Charge-offs | 0 | 0 | (529) | 0
Recoveries | 23 | 485 | 820 | 2,731
Ending Allowance | 25,300 | 23,885 | 25,300 | 23,885
Provisions & Transfers | 595 | (3,422) | 1,572 | (1,362)
Commercial loans | Commercial & industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 53,903 | 47,794 | 45,957 | 38,665
Charge-offs | (27) | (11) | (943) | (31)
Recoveries | 8 | 13 | 72 | 74
Ending Allowance | 54,924 | 45,538 | 54,924 | 45,538
Provisions & Transfers | 1,040 | (2,258) | 9,838 | 6,830
Commercial loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 22,707 | 22,549 | 25,585 | 24,156
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 2,179 | 0
Ending Allowance | 25,834 | 24,823 | 25,834 | 24,823
Provisions & Transfers | 3,127 | 2,274 | (1,930) | 667
Commercial loans | Land - acquisition & development |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 13,685 | 10,503 | 13,447 | 10,733
Charge-offs | (1) | 0 | (3) | 0
Recoveries | 11 | 9 | 51 | 454
Ending Allowance | 12,227 | 11,605 | 12,227 | 11,605
Provisions & Transfers | (1,468) | 1,093 | (1,268) | 418
Consumer loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 41,944 | 47,209 | 45,925 | 57,032
Charge-offs | (253) | (36) | (395) | (376)
Recoveries | 834 | 671 | 1,927 | 2,477
Ending Allowance | 40,120 | 47,265 | 40,120 | 47,265
Provisions & Transfers | (2,405) | (579) | (7,337) | (11,868)
Consumer loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 3,129 | 3,248 | 4,907 | 3,555
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Ending Allowance | 3,354 | 3,522 | 3,354 | 3,522
Provisions & Transfers | 225 | 274 | (1,553) | (33)
Consumer loans | Single-family residential |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 28,992 | 35,108 | 30,978 | 45,186
Charge-offs | 0 | 0 | 0 | (106)
Recoveries | 252 | 324 | 804 | 1,600
Ending Allowance | 26,217 | 34,190 | 26,217 | 34,190
Provisions & Transfers | (3,027) | (1,242) | (5,565) | (12,490)
Consumer loans | Land - consumer lot loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 5,105 | 3,292 | 4,939 | 2,729
Charge-offs | 0 | 0 | (27) | 0
Recoveries | 2 | 7 | 47 | 21
Ending Allowance | 5,220 | 3,711 | 5,220 | 3,711
Provisions & Transfers | 113 | 412 | 261 | 961
Consumer loans | HELOC |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 2,475 | 2,226 | 2,390 | 2,571
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 249 | 51 | 350 | 51
Ending Allowance | 2,632 | 2,213 | 2,632 | 2,213
Provisions & Transfers | (92) | (64) | (108) | (409)
Consumer loans | Consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 2,243 | 3,335 | 2,711 | 2,991
Charge-offs | (253) | (36) | (368) | (270)
Recoveries | 331 | 289 | 726 | 805
Ending Allowance | 2,697 | 3,629 | 2,697 | 3,629
Provisions & Transfers | $ 376 | $ 41 | $ (372) | $ 103

X
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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