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Derivatives and Hedging Activities - Narrative (Details) - USD ($)
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Interest Rate Swap | Minimum    
Derivative [Line Items]    
Derivative, maturities 1 year  
Interest Rate Swap | Maximum    
Derivative [Line Items]    
Derivative, maturities 6 years  
Interest Rate Swap | Weighted average    
Derivative [Line Items]    
Derivative, maturities 5 years 3 months 18 days  
Interest rate contracts    
Derivative [Line Items]    
Derivative instruments not designated as hedging instruments, gain (loss), net $ 109,000 $ 0