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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details)
12 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
security
Available for sale [Abstract]    
Less than 12 months, Fair value $ 10,995,000 $ 143,000
Less than 12 months, Gross unrealized losses (783,000) $ (1,000)
12 months or longer, Fair value 90,000  
12 months or longer, Gross unrealized losses $ (7,000)  
Number of securities | security 12 6
Total, Fair value $ 11,085,000 $ 143,000
Total, Gross unrealized losses (790,000) (1,000)
Held to maturity [Abstract]    
Less than 12 months, Fair value 4,095,000 1,496,000
Less than 12 months, Gross unrealized losses (319,000) $ (4,000)
12 months or longer, Fair value 0  
12 months or longer, Gross unrealized losses $ 0  
Number of securities | security 5 1
Total, Fair value $ 4,095,000 $ 1,496,000
Total, Gross unrealized losses (319,000) (4,000)
Other than temporary impairment loss recognized on any securities 0 0
U.S. GSE residential mortgage-backed securities | Residential Mortgage Backed Securities    
Available for sale [Abstract]    
Less than 12 months, Fair value 152,000 143,000
Less than 12 months, Gross unrealized losses (126,000) $ (1,000)
12 months or longer, Fair value 90,000  
12 months or longer, Gross unrealized losses $ (7,000)  
Number of securities | security 6 6
Total, Fair value $ 242,000 $ 143,000
Total, Gross unrealized losses (133,000) (1,000)
Held to maturity [Abstract]    
Less than 12 months, Fair value 1,618,000  
Less than 12 months, Gross unrealized losses (160,000)  
12 months or longer, Fair value 0  
12 months or longer, Gross unrealized losses $ 0  
Number of securities | security 4  
Total, Fair value $ 1,618,000  
Total, Gross unrealized losses (160,000)  
U.S. GSE commercial mortgage-backed securities | Commercial Mortgage Backed Securities    
Held to maturity [Abstract]    
Less than 12 months, Fair value 2,477,000  
Less than 12 months, Gross unrealized losses (159,000)  
12 months or longer, Fair value 0  
12 months or longer, Gross unrealized losses $ 0  
Number of securities | security 1  
Total, Fair value $ 2,477,000  
Total, Gross unrealized losses (159,000)  
Corporate Bonds    
Available for sale [Abstract]    
Less than 12 months, Fair value 10,843,000  
Less than 12 months, Gross unrealized losses (657,000)  
12 months or longer, Fair value 0  
12 months or longer, Gross unrealized losses $ 0  
Number of securities | security 6  
Total, Fair value $ 10,843,000  
Total, Gross unrealized losses $ (657,000)  
Held to maturity [Abstract]    
Less than 12 months, Fair value   1,496,000
Less than 12 months, Gross unrealized losses   $ (4,000)
Number of securities | security   1
Total, Fair value   $ 1,496,000
Total, Gross unrealized losses   $ (4,000)