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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
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 1.86%  
Operating lease payments $ 6,425 $ 6,494
Right-of-use assets obtained in exchange for lease liabilities 2,864 8,341
Rental expense 7,849 6,455
Loans in process 2,232,836 1,456,072
Reserve for unfunded commitments 27,500 25,000
Loans receivable    
Commitment and Contingencies [Line Items]    
Loans in process $ 3,804,444 $ 2,738,095