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Derivatives and Hedging Activities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Interest Rate Swap | Minimum        
Derivative [Line Items]        
Derivative, maturities 1 year   1 year  
Interest Rate Swap | Maximum        
Derivative [Line Items]        
Derivative, maturities 6 years   6 years  
Interest Rate Swap | Weighted average        
Derivative [Line Items]        
Derivative, maturities 5 years   5 years  
Interest rate contracts        
Derivative [Line Items]        
Derivative instruments not designated as hedging instruments, gain (loss), net $ 6 $ 26 $ 114 $ 26