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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | $ 171,411 | $ 170,189 | $ 171,300 | $ 166,955
Charge-offs | (912) | (208) | (1,589) | (360)
Recoveries | 1,385 | 2,672 | 4,173 | 4,558
Provision & Transfers | (500) | 0 | (2,500) | 1,500
Ending Allowance | 171,384 | 172,653 | 171,384 | 172,653
Unfunded commitments |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision & Transfers | 0 | 0 | 2,500 | 1,500
Commercial loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 127,837 | 119,207 | 125,375 | 109,923
Charge-offs | (873) | (18) | (1,447) | (20)
Recoveries | 954 | 1,878 | 3,080 | 2,752
Provision & Transfers | 1,522 | 4,377 | 2,432 | 12,789
Ending Allowance | 129,440 | 125,444 | 129,440 | 125,444
Commercial loans | Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 15,993 | 14,363 | 16,949 | 13,853
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision & Transfers | (1,530) | 3,413 | (2,486) | 3,923
Ending Allowance | 14,463 | 17,776 | 14,463 | 17,776
Commercial loans | Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 25,722 | 23,496 | 23,437 | 22,516
Charge-offs | 0 | 0 | (529) | 0
Recoveries | 753 | 1,457 | 797 | 2,246
Provision & Transfers | (1,793) | 1,869 | 977 | 2,060
Ending Allowance | 24,682 | 26,822 | 24,682 | 26,822
Commercial loans | Commercial & industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 47,231 | 44,317 | 45,957 | 38,665
Charge-offs | (873) | (18) | (916) | (20)
Recoveries | 2 | 11 | 64 | 61
Provision & Transfers | 7,543 | 3,484 | 8,798 | 9,088
Ending Allowance | 53,903 | 47,794 | 53,903 | 47,794
Commercial loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 24,766 | 26,365 | 25,585 | 24,156
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 179 | 0 | 2,179 | 0
Provision & Transfers | (2,238) | (3,816) | (5,057) | (1,607)
Ending Allowance | 22,707 | 22,549 | 22,707 | 22,549
Commercial loans | Land - acquisition & development |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 14,125 | 10,666 | 13,447 | 10,733
Charge-offs | 0 | 0 | (2) | 0
Recoveries | 20 | 410 | 40 | 445
Provision & Transfers | (460) | (573) | 200 | (675)
Ending Allowance | 13,685 | 10,503 | 13,685 | 10,503
Consumer loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 43,574 | 50,982 | 45,925 | 57,032
Charge-offs | (39) | (190) | (142) | (340)
Recoveries | 431 | 794 | 1,093 | 1,806
Provision & Transfers | (2,022) | (4,377) | (4,932) | (11,289)
Ending Allowance | 41,944 | 47,209 | 41,944 | 47,209
Consumer loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 3,719 | 3,594 | 4,907 | 3,555
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision & Transfers | (590) | (346) | (1,778) | (307)
Ending Allowance | 3,129 | 3,248 | 3,129 | 3,248
Consumer loans | Single-family residential |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 30,106 | 38,613 | 30,978 | 45,186
Charge-offs | 0 | (106) | 0 | (106)
Recoveries | 147 | 497 | 552 | 1,276
Provision & Transfers | (1,261) | (3,896) | (2,538) | (11,248)
Ending Allowance | 28,992 | 35,108 | 28,992 | 35,108
Consumer loans | Land - consumer lot loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 4,984 | 2,958 | 4,939 | 2,729
Charge-offs | 0 | 0 | (27) | 0
Recoveries | 40 | 7 | 45 | 14
Provision & Transfers | 81 | 327 | 148 | 549
Ending Allowance | 5,105 | 3,292 | 5,105 | 3,292
Consumer loans | HELOC |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 2,365 | 2,362 | 2,390 | 2,571
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 100 | 0 | 101 | 0
Provision & Transfers | 10 | (136) | (16) | (345)
Ending Allowance | 2,475 | 2,226 | 2,475 | 2,226
Consumer loans | Consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 2,400 | 3,455 | 2,711 | 2,991
Charge-offs | (39) | (84) | (115) | (234)
Recoveries | 144 | 290 | 395 | 516
Provision & Transfers | (262) | (326) | (748) | 62
Ending Allowance | $ 2,243 | $ 3,335 | $ 2,243 | $ 3,335

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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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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