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Allowance for Loan Losses - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Provision (release) for credit losses | $ 500,000 | $ 21,750,000 | $ (1,650,000)
Recoveries, net of charge-offs | 6,345,000 | 3,271,000 |
Allowance for loan losses | 171,300,000 | 166,955,000 | 131,534,000
SBA PPP loans | 13,833,570,000 | 12,792,317,000 |
Loans Subject to Quantitative Evaluation |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses | 120,357,000 |  |
Loans Subject to Management Qualitative Evaluation |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses | 50,943,000 |  |
Non-Performing Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing receivable, gross | $ 43,625,000 | $ 37,695,000 |
Ratio of non-performing assets to total assets | 0.22% | 0.20% |
Financial Asset Originated |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Non-accrual | $ 31,749,000 | $ 29,056,000 |
Commercial loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses | 125,375,000 | 109,923,000 | 93,470,000
Commercial loans | Financial Asset Originated |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Non-accrual | 11,723,000 | 5,769,000 |
Commercial loans | Commercial & industrial |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses | 45,957,000 | 38,665,000 | $ 31,450,000
Commercial loans | Commercial & industrial | Financial Asset Originated |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Non-accrual | 365,000 | $ 329,000 |
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses | 0 |  |
SBA PPP loans | $ 305,162,000 |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + 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 http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount excluding accrued interest, after allowance for credit loss, of financing receivable. + 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 http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) + Details
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