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Loans and Allowance for Credit Losses - Schedule of Monitors the Performance of Loan Modifications to Borrowers Experiencing Financial Difficulty to Understand the Effectiveness of its Modification Efforts (Details) - Extended Maturity - Portfolio Segment After Reclassifications - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | $ 134,032 | $ 137,391
30-59 Days Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 5,707 | 1,086
60-89 Days Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 3,726 | 0
Past Due 90 Days or More |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 25,317 | 2,541
Total Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 34,750 | 3,627
Current |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 99,282 | 133,764
Commercial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 35,715 | 20,811
Commercial | 30-59 Days Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 0 | 0
Commercial | 60-89 Days Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 0 | 0
Commercial | Past Due 90 Days or More |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 3,854 | 2,541
Commercial | Total Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 3,854 | 2,541
Commercial | Current |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 31,861 | 18,270
Commercial real estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 98,317 | 116,580
Commercial real estate | 30-59 Days Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 5,707 | 1,086
Commercial real estate | 60-89 Days Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 3,726 | 0
Commercial real estate | Past Due 90 Days or More |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 21,463 | 0
Commercial real estate | Total Past Due |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | 30,896 | 1,086
Commercial real estate | Current |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total | $ 67,421 | $ 115,494

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