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Loans and Leases and the Allowance for Credit Losses - Schedule of Aging Analysis of Loan Modifications Made to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | $ 34,995 | $ 16,300
Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 32,543 | 14,292
30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 1,898 | 978
60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 300 | 133
Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 193 | 50
Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 61 | 847
Commercial |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 4,467 | 7,157
Commercial | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 4,467 | 7,067
Commercial | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 90
Commercial | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Commercial | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Commercial | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Commercial | Commercial and Industrial |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 4,467 | 6,211
Commercial | Commercial and Industrial | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 4,467 | 6,121
Commercial | Commercial and Industrial | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 90
Commercial | Commercial and Industrial | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Commercial | Commercial and Industrial | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Commercial | Commercial and Industrial | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Commercial | Commercial Mortgage |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty |  | 946
Commercial | Commercial Mortgage | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty |  | 946
Commercial | Commercial Mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty |  | 0
Commercial | Commercial Mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty |  | 0
Commercial | Commercial Mortgage | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty |  | 0
Commercial | Commercial Mortgage | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty |  | 0
Consumer |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 30,528 | 9,143
Consumer | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 28,076 | 7,225
Consumer | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 1,898 | 888
Consumer | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 300 | 133
Consumer | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 193 | 50
Consumer | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 61 | 847
Consumer | Other |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 1,593 | 732
Consumer | Other | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 1,326 | 584
Consumer | Other | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 115 | 95
Consumer | Other | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 75 | 31
Consumer | Other | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 77 | 22
Consumer | Other | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Consumer | Residential Mortgage |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 14,718 | 847
Consumer | Residential Mortgage | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 14,718 | 0
Consumer | Residential Mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Consumer | Residential Mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Consumer | Residential Mortgage | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Consumer | Residential Mortgage | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 847
Consumer | Home Equity |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 1,116 | 136
Consumer | Home Equity | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 1,055 | 136
Consumer | Home Equity | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Consumer | Home Equity | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Consumer | Home Equity | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 0 | 0
Consumer | Home Equity | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 61 | 0
Consumer | Automobile |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 13,101 | 7,428
Consumer | Automobile | Current |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 10,977 | 6,505
Consumer | Automobile | 30 - 59 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 1,783 | 793
Consumer | Automobile | 60 - 89 Days Past Due |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 225 | 102
Consumer | Automobile | Past Due 90 Days or More |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | 116 | 28
Consumer | Automobile | Non-Accural |  |
Financing Receivable, Modified [Line Items] |  |
Loan modifications made to borrowers experiencing financial difficulty | $ 0 | $ 0

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