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Loans Receivable - Schedule of Loan Modifications (Details) - Term Extension - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 9,851 | $ 8,303
% of Total Loan Class Balance | 0.05% | 0.05%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 9,396 | $ 8,303
% of Total Loan Class Balance | 0.08% | 0.09%
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount |  | $ 143
% of Total Loan Class Balance |  | 0.00%
Wtd. Avg. Term Extension |  | 20 months
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 9,396 | $ 7,814
% of Total Loan Class Balance | 0.39% | 0.33%
Wtd. Avg. Term Extension | 14 months | 4 months
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount |  | $ 346
% of Total Loan Class Balance |  | 0.02%
Wtd. Avg. Term Extension |  | 4 months
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 455 |
% of Total Loan Class Balance | 0.01% |
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified in period, amount | $ 455 |
% of Total Loan Class Balance | 0.01% |
Wtd. Avg. Term Extension | 6 months |

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