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Derivatives and Hedging Activities - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Interest rate contracts    
Derivative [Line Items]    
Derivative instruments not designated as hedging instruments, gain (loss), net $ (870,000) $ 0
Minimum    
Derivative [Line Items]    
Derivative maturities 1 year  
Maximum    
Derivative [Line Items]    
Derivative maturities 7 years  
Weighted average    
Derivative [Line Items]    
Derivative maturities 5 years 6 months