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Derivatives and Hedging Activities - Impact of Fair Value Hedge Accounting on the Carrying Value of the Hedged Items (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Sep. 30, 2022
Derivatives, Fair Value [Line Items]    
Carrying value of hedged items $ 1,131,282 $ 1,159,496
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items (35,958) (39,090)
Loans Receivable    
Derivatives, Fair Value [Line Items]    
Carrying value of hedged items 1,131,282 1,159,496
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items (35,958) (39,090)
Other liabilities    
Derivatives, Fair Value [Line Items]    
Notional amount 583,782 588,676
Mortgage loan fair value hedges    
Derivatives, Fair Value [Line Items]    
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items (33,423) (36,458)
Notional amount 470,000  
Mortgage loan fair value hedges | Loans Receivable    
Derivatives, Fair Value [Line Items]    
Carrying value of hedged items 1,094,211 1,119,975
Mortgage loan fair value hedges | Other liabilities    
Derivatives, Fair Value [Line Items]    
Notional amount 0 0
Commercial loan fair value hedges    
Derivatives, Fair Value [Line Items]    
Cumulative gain (loss) fair value hedge adjustment included in carrying amount of hedged items (2,535) (2,632)
Commercial loan fair value hedges | Loans Receivable    
Derivatives, Fair Value [Line Items]    
Carrying value of hedged items 37,071 39,521
Commercial loan fair value hedges | Other liabilities    
Derivatives, Fair Value [Line Items]    
Notional amount $ 0 $ 0