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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, 2025	Sep. 30, 2024
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	$ 18,555	$ 34,995
Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	13,557	32,543
30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	2,029	1,898
60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	297	300
Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	134	193
Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	2,538	61
Commercial
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	2,325	4,467
Commercial | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	215	4,467
Commercial | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	25	0
Commercial | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Commercial | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Commercial | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	2,085	0
Commercial | Commercial Mortgage
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	2,085
Commercial | Commercial Mortgage | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0
Commercial | Commercial Mortgage | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0
Commercial | Commercial Mortgage | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0
Commercial | Commercial Mortgage | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0
Commercial | Commercial Mortgage | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	2,085
Commercial | Commercial and Industrial
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	240	4,467
Commercial | Commercial and Industrial | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	215	4,467
Commercial | Commercial and Industrial | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	25	0
Commercial | Commercial and Industrial | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Commercial | Commercial and Industrial | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Commercial | Commercial and Industrial | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	16,230	30,528
Consumer | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	13,342	28,076
Consumer | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	2,004	1,898
Consumer | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	297	300
Consumer | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	134	193
Consumer | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	453	61
Consumer | Residential Mortgage
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	1,025	14,718
Consumer | Residential Mortgage | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	572	14,718
Consumer | Residential Mortgage | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer | Residential Mortgage | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer | Residential Mortgage | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer | Residential Mortgage | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	453	0
Consumer | Home Equity
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	1,063	1,116
Consumer | Home Equity | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	1,063	1,055
Consumer | Home Equity | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer | Home Equity | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer | Home Equity | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer | Home Equity | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	61
Consumer | Automobile
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	12,301	13,101
Consumer | Automobile | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	10,119	10,977
Consumer | Automobile | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	1,880	1,783
Consumer | Automobile | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	209	225
Consumer | Automobile | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	93	116
Consumer | Automobile | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	0	0
Consumer | Other
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	1,841	1,593
Consumer | Other | Current
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	1,588	1,326
Consumer | Other | 30 - 59 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	124	115
Consumer | Other | 60 - 89 Days Past Due
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	88	75
Consumer | Other | Past Due 90 Days or More
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	41	77
Consumer | Other | Non-Accrual
Financing Receivable Modifications [Line Items]
Loan modifications made to borrowers experiencing financial difficulty	$ 0	$ 0

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