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Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | $ 177,207 | $ 172,808
Charge-offs | (293) | (228)
Recoveries | 406 | 717
Provision & Transfers | 2,000 | 3,500
Ending Allowance | 179,320 | 176,797
Provision recapture | (2,000) | (3,500)
Unfunded commitments |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision & Transfers | (2,000) | (1,000)
Provision recapture | 2,000 | 1,000
Commercial loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 137,194 | 133,476
Charge-offs | (80) | (82)
Recoveries | 84 | 52
Provision & Transfers | 1,957 | 4,836
Ending Allowance | 139,155 | 138,282
Provision recapture | (1,957) | (4,836)
Commercial loans | Multi-family |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 13,155 | 12,013
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | 636 | 311
Ending Allowance | 13,791 | 12,324
Provision recapture | (636) | (311)
Commercial loans | Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 28,842 | 25,814
Charge-offs | 0 | 0
Recoveries | 2 | 4
Provision & Transfers | 163 | 1,562
Ending Allowance | 29,007 | 27,380
Provision recapture | (163) | (1,562)
Commercial loans | Commercial & industrial |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 58,773 | 57,210
Charge-offs | (62) | (82)
Recoveries | 32 | 32
Provision & Transfers | 2,093 | 6,713
Ending Allowance | 60,836 | 63,873
Provision recapture | (2,093) | (6,713)
Commercial loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 29,408 | 26,161
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | (545) | (28)
Ending Allowance | 28,863 | 26,133
Provision recapture | 545 | 28
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 7,016 | 12,278
Charge-offs | (18) | 0
Recoveries | 50 | 16
Provision & Transfers | (390) | (3,722)
Ending Allowance | 6,658 | 8,572
Provision recapture | 390 | 3,722
Consumer loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 40,013 | 39,332
Charge-offs | (213) | (146)
Recoveries | 322 | 665
Provision & Transfers | 43 | (1,336)
Ending Allowance | 40,165 | 38,515
Provision recapture | (43) | 1,336
Consumer loans | Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,781 | 3,410
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | (519) | 90
Ending Allowance | 2,262 | 3,500
Provision recapture | 519 | (90)
Consumer loans | Single-family residential |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 28,029 | 25,518
Charge-offs | 0 | 0
Recoveries | 120 | 430
Provision & Transfers | 407 | (473)
Ending Allowance | 28,556 | 25,475
Provision recapture | (407) | 473
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 3,512 | 5,047
Charge-offs | 0 | 0
Recoveries | 9 | 0
Provision & Transfers | (176) | (905)
Ending Allowance | 3,345 | 4,142
Provision recapture | 176 | 905
Consumer loans | HELOC |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,859 | 2,482
Charge-offs | 0 | 0
Recoveries | 1 | 1
Provision & Transfers | 113 | 105
Ending Allowance | 2,973 | 2,588
Provision recapture | (113) | (105)
Consumer loans | Consumer |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,832 | 2,875
Charge-offs | (213) | (146)
Recoveries | 192 | 234
Provision & Transfers | 218 | (153)
Ending Allowance | 3,029 | 2,810
Provision recapture | $ (218) | $ 153

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- 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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