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Derivatives and Hedging Activities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Interest rate contracts        
Derivative [Line Items]        
Derivative instruments not designated as hedging instruments, gain (loss), net $ 65 $ 6 $ 70 $ 114
Minimum        
Derivative [Line Items]        
Derivative, maturities 1 year   1 year  
Maximum        
Derivative [Line Items]        
Derivative, maturities 5 years   5 years  
Weighted average        
Derivative [Line Items]        
Derivative, maturities 4 years 7 months 6 days   4 years 7 months 6 days