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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, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | $ 170,189 | $ 147,513 | $ 166,955 | $ 149,284
Charge-offs | (208) | (449) | (360) | (1,067)
Recoveries | 2,672 | 2,237 | 4,558 | 5,434
Provision & Transfers | 0 | 7,800 | 1,500 | 3,450
Ending Allowance | 172,653 | 157,101 | 172,653 | 157,101
Unfunded commitments |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision & Transfers |  | 400 | 1,500 | 1,000
Commercial loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 119,207 | 89,581 | 109,923 | 89,335
Charge-offs | (18) | (142) | (20) | (301)
Recoveries | 1,878 | 1,208 | 2,752 | 3,732
Provision & Transfers | 4,377 | 8,057 | 12,789 | 5,938
Ending Allowance | 125,444 | 98,704 | 125,444 | 98,704
Commercial loans | Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 14,363 | 10,506 | 13,853 | 10,404
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 498
Provision & Transfers | 3,413 | 1,236 | 3,923 | 840
Ending Allowance | 17,776 | 11,742 | 17,776 | 11,742
Commercial loans | Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 23,496 | 13,067 | 22,516 | 13,024
Charge-offs | 0 | (13) | 0 | (111)
Recoveries | 1,457 | 1,020 | 2,246 | 1,388
Provision & Transfers | 1,869 | 565 | 2,060 | 338
Ending Allowance | 26,822 | 14,639 | 26,822 | 14,639
Commercial loans | Commercial & industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 44,317 | 33,676 | 38,665 | 32,235
Charge-offs | (18) | (129) | (20) | (179)
Recoveries | 11 | 57 | 61 | 201
Provision & Transfers | 3,484 | 4,972 | 9,088 | 6,319
Ending Allowance | 47,794 | 38,576 | 47,794 | 38,576
Commercial loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 26,365 | 21,919 | 24,156 | 22,768
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 5 | 0 | 59
Provision & Transfers | (3,816) | 1,424 | (1,607) | 521
Ending Allowance | 22,549 | 23,348 | 22,549 | 23,348
Commercial loans | Land - acquisition & development |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 10,666 | 10,413 | 10,733 | 10,904
Charge-offs | 0 | 0 | 0 | (11)
Recoveries | 410 | 126 | 445 | 1,586
Provision & Transfers | (573) | (140) | (675) | (2,080)
Ending Allowance | 10,503 | 10,399 | 10,503 | 10,399
Consumer loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 50,982 | 57,932 | 57,032 | 59,949
Charge-offs | (190) | (307) | (340) | (766)
Recoveries | 794 | 1,029 | 1,806 | 1,702
Provision & Transfers | (4,377) | (257) | (11,289) | (2,488)
Ending Allowance | 47,209 | 58,397 | 47,209 | 58,397
Consumer loans | Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 3,594 | 2,930 | 3,555 | 2,880
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision & Transfers | (346) | 245 | (307) | 295
Ending Allowance | 3,248 | 3,175 | 3,248 | 3,175
Consumer loans | Single-family residential |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 38,613 | 46,356 | 45,186 | 47,771
Charge-offs | (106) | 0 | (106) | (15)
Recoveries | 497 | 192 | 1,276 | 453
Provision & Transfers | (3,896) | 268 | (11,248) | (1,393)
Ending Allowance | 35,108 | 46,816 | 35,108 | 46,816
Consumer loans | Land - consumer lot loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 2,958 | 2,567 | 2,729 | 2,635
Charge-offs | 0 | (77) | 0 | (147)
Recoveries | 7 | 476 | 14 | 486
Provision & Transfers | 327 | (388) | 549 | (396)
Ending Allowance | 3,292 | 2,578 | 3,292 | 2,578
Consumer loans | HELOC |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 2,362 | 2,034 | 2,571 | 2,048
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 1 | 0 | 94
Provision & Transfers | (136) | 211 | (345) | 104
Ending Allowance | 2,226 | 2,246 | 2,226 | 2,246
Consumer loans | Consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Allowance | 3,455 | 4,045 | 2,991 | 4,615
Charge-offs | (84) | (230) | (234) | (604)
Recoveries | 290 | 360 | 516 | 669
Provision & Transfers | (326) | (593) | 62 | (1,098)
Ending Allowance | $ 3,335 | $ 3,582 | $ 3,335 | $ 3,582

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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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