Fair Value Measurements - Summary of Assets and Liabilities Classified as Level 3 and Measured at Fair Value on Nonrecurring Basis (Details)	6 Months Ended	9 Months Ended
Jun. 30, 2026	Sep. 30, 2025
Level 3 \| Measurement Input, Discount Rate \| Valuation, Market Approach
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans, measurement input	8.40%	8.10%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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