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Fair Value Measurements - Fair Value Measured on Nonrecurring Basis (Details) - Nonrecurring - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value disclosure $ 2,141 $ 3,685 $ 2,141 $ 3,685
Loans receivable/Impaired loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value disclosure 781 3,313 781 3,313
Real estate owned        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value disclosure 1,360 372 1,360 372
Changes measurement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total gains (losses) (2,043) (6,098) (2,200) (6,221)
Changes measurement | Loans receivable/Impaired loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total gains (losses) (168) (6,120) (325) (6,243)
Changes measurement | Real estate owned        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total gains (losses) (1,875) 22 (1,875) 22
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 2,141 3,685 2,141 3,685
Level 3 | Loans receivable/Impaired loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value disclosure 781 3,313 781 3,313
Level 3 | Real estate owned        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value disclosure $ 1,360 $ 372 $ 1,360 $ 372