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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
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 1.99%  
Operating lease payments $ 6,788 $ 6,425
Right-of-use assets obtained in exchange for lease liabilities 3,611 2,864
Rental expense 8,191 7,849
Loans in process 3,006,023 2,232,836
Reserve for unfunded commitments 32,500 27,500
Loans receivable    
Commitment and Contingencies [Line Items]    
Loans in process $ 4,947,570 $ 3,804,444