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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Commitment and Contingencies [Line Items]    
Operating lease liability, statement of financial position [Extensible Enumeration] Accrued expenses and other liabilities Accrued expenses and other liabilities
Operating lease right-of-use asset, statement of financial position [Extensible Enumeration] Other assets Other assets
Weighted average remaining lease term 8 years 6 months  
Weighted average discount rate 2.27%  
Operating lease payments $ 6,418 $ 6,788
Right-of-use assets obtained in exchange for lease liabilities 2,349 3,611
Rental expense 7,686 8,191
Loans in process 1,895,940 3,006,023
Reserve for unfunded commitments 24,500 32,500
Loans receivable    
Commitment and Contingencies [Line Items]    
Loans in process $ 3,625,333 $ 4,947,570