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Fair Value Measurements - Narrative (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Available-for-sale securities purchased $ 49,380,000 $ 115,909,000  
Proceeds from sales of available-for-sale securities 2,624,000 0  
Held-to-maturity securities purchased 0 0  
Proceeds from sale of held-to-maturity securities $ 0 $ 0  
Term of contractual due dates, mortgage-backed securities 25 years    
Accrued interest for available-for-sale securities $ 8,270,000   $ 8,641,000
Accrued interest for held-to-maturity securities 992,000   $ 1,013,000
Consumer loans | Single-family residential      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Foreclosed residential real estate properties held as REO 121,000    
Real estate acquired through foreclosure $ 3,338,000