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Allowance for Losses on Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | $ 157,101 | $ 133,086 | $ 131,534 | $ 129,257
Charge-offs | (3,327) | (4,752) | (4,395) | (7,408)
Recoveries | 1,625 | 5,688 | 7,060 | 10,923
Provision & Transfers | 9,950 | 0 | 13,400 | 1,250
Ending Allowance (After ASC 326 Adoption) | 165,349 | 134,022 | 165,349 | 134,022
Commercial loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 98,704 | 93,546 | 93,470 | 88,178
Charge-offs | (3,034) | (4,099) | (3,335) | (4,903)
Recoveries | 800 | 5,333 | 4,532 | 9,243
Provision & Transfers | 9,938 | 23 | 15,876 | 2,285
Ending Allowance (After ASC 326 Adoption) | 106,408 | 94,803 | 106,408 | 94,803
Commercial loans | Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 11,742 | 7,394 | 7,391 | 8,329
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 498 | 0
Provision & Transfers | 346 | (111) | 1,186 | (1,046)
Ending Allowance (After ASC 326 Adoption) | 12,088 | 7,283 | 12,088 | 7,283
Commercial loans | Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 14,639 | 12,448 | 13,170 | 11,852
Charge-offs | 0 | 0 | (111) | (339)
Recoveries | 193 | 90 | 1,581 | 860
Provision & Transfers | 975 | 466 | 1,313 | 631
Ending Allowance (After ASC 326 Adoption) | 15,807 | 13,004 | 15,807 | 13,004
Commercial loans | Commercial & industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 38,576 | 30,574 | 31,450 | 28,702
Charge-offs | (3,034) | (4,034) | (3,213) | (4,499)
Recoveries | 174 | 3,218 | 375 | 3,276
Provision & Transfers | 6,463 | 1,313 | 12,782 | 3,592
Ending Allowance (After ASC 326 Adoption) | 42,179 | 31,071 | 42,179 | 31,071
Commercial loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 23,348 | 33,396 | 32,304 | 31,317
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 59 | 0
Provision & Transfers | 2,345 | 661 | 2,866 | 2,740
Ending Allowance (After ASC 326 Adoption) | 25,693 | 34,057 | 25,693 | 34,057
Commercial loans | Land - acquisition & development |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 10,399 | 9,734 | 9,155 | 7,978
Charge-offs | 0 | (65) | (11) | (65)
Recoveries | 433 | 2,025 | 2,019 | 5,107
Provision & Transfers | (191) | (2,306) | (2,271) | (3,632)
Ending Allowance (After ASC 326 Adoption) | 10,641 | 9,388 | 10,641 | 9,388
Consumer loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 58,397 | 39,540 | 38,064 | 41,079
Charge-offs | (293) | (653) | (1,060) | (2,505)
Recoveries | 825 | 355 | 2,528 | 1,680
Provision & Transfers | 12 | (23) | (2,476) | (1,035)
Ending Allowance (After ASC 326 Adoption) | 58,941 | 39,219 | 58,941 | 39,219
Consumer loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 3,175 | 1,976 | 1,369 | 1,842
Charge-offs | 0 | (339) | 0 | (339)
Recoveries | 0 | 0 | 0 | 0
Provision & Transfers | 161 | 247 | 456 | 381
Ending Allowance (After ASC 326 Adoption) | 3,336 | 1,884 | 3,336 | 1,884
Consumer loans | Single-family residential |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 46,817 | 31,476 | 30,988 | 33,033
Charge-offs | (60) | (65) | (75) | (238)
Recoveries | 437 | 47 | 891 | 586
Provision & Transfers | (45) | 56 | (1,438) | (1,867)
Ending Allowance (After ASC 326 Adoption) | 47,149 | 31,514 | 47,149 | 31,514
Consumer loans | Land - consumer lot loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 2,578 | 2,076 | 2,143 | 2,164
Charge-offs | 0 | (215) | (147) | (336)
Recoveries | 17 | 0 | 503 | 265
Provision & Transfers | 76 | 171 | (320) | (61)
Ending Allowance (After ASC 326 Adoption) | 2,671 | 2,032 | 2,671 | 2,032
Consumer loans | HELOC |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 2,246 | 1,082 | 1,103 | 781
Charge-offs | 0 | 0 | 0 | (1,086)
Recoveries | 1 | 1 | 95 | 45
Provision & Transfers | 341 | 4 | 445 | 1,347
Ending Allowance (After ASC 326 Adoption) | 2,588 | 1,087 | 2,588 | 1,087
Consumer loans | Consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance (After ASC 326 Adoption) | 3,581 | 2,930 | 2,461 | 3,259
Charge-offs | (233) | (34) | (838) | (506)
Recoveries | 370 | 307 | 1,039 | 784
Provision & Transfers | (521) | (501) | (1,619) | (835)
Ending Allowance (After ASC 326 Adoption) | $ 3,197 | $ 2,702 | $ 3,197 | $ 2,702

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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=121611835&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=121599878&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=121599337&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=121599337&loc=SL82919249-210447 + 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=121647567&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=121599337&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=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + 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 http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 3: 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=121647567&loc=SL82922352-210448 + Details
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