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Fair Value Measurements - Fair Value Measured on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | $ 5,805 | $ 38,207 | $ 5,805 | $ 38,207
Loans receivable/Impaired loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 4,345 | 34,535 | 4,345 | 34,535
Real estate owned |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 1,460 | 3,672 | 1,460 | 3,672
Changes measurement |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total gains (losses) | (2,714) | (10,651) | (4,914) | (16,871)
Changes measurement | Loans receivable/Impaired loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total gains (losses) | (2,679) | (10,530) | (3,004) | (16,773)
Changes measurement | Real estate owned |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total gains (losses) | (35) | (121) | (1,910) | (98)
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 0 | 0 | 0 | 0
Level 1 | Loans receivable/Impaired loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 0 | 0 | 0 | 0
Level 1 | Real estate owned |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 0 | 0 | 0 | 0
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 0 | 0 | 0 | 0
Level 2 | Loans receivable/Impaired loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 0 | 0 | 0 | 0
Level 2 | Real estate owned |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 0 | 0 | 0 | 0
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 5,805 | 38,207 | 5,805 | 38,207
Level 3 | Loans receivable/Impaired loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | 4,345 | 34,535 | 4,345 | 34,535
Level 3 | Real estate owned |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value disclosure | $ 1,460 | $ 3,672 | $ 1,460 | $ 3,672

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- Definition Fair value adjustments to collateral dependent loans and real estate held for sale are recorded to reflect write-downs of principal balances based on the current appraised or estimated value of the collateral. + References No definition available. + Details
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