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Investment Securities - Additional information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
position
security
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
position
security
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
security
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Investment Securities:              
Held to maturity securities, fair value $ 61,890,000   $ 61,890,000   $ 58,621,000    
The weighted average duration of the total investment securities portfolio     43 months 21 days   49 months 12 days    
Proceeds from sales of investment securities - available for sale 0   $ 935,000 $ 0      
Book value of securities available for sale and held to maturity 137,120,000   137,120,000   $ 135,624,000    
Accrued interest receivable on available for sale debt securities 1,100,000   1,100,000   988,000    
Gross investment gains     $ 0        
Premium percentage on mortgage backed securities purchased     100.70%        
Unrealized loss on equity securities     $ 0        
Held to maturity, allowance for credit losses 88,000   88,000 32,000 37,000 $ 100,000 $ 109,000
Accrued interest receivable on held to maturity debt securities 439,000   439,000   388,000    
Held to maturity debt securities in non-accrual 0   0   0    
Charge-off resulted from sale of securities     491,000        
Provision for credit losses recovery recognized     75,000        
Available for Sale Securities, allowance for credit losses $ 360,000   $ 360,000 926,000 $ 926,000 360,000 926,000
Number of available for sale debt securities in non accrual status | security 1   1   1    
Available-for-Sale debt securities in non-accrual $ 1,000,000.0   $ 1,000,000.0   $ 926,000    
Unpaid interest 73,000   $ 73,000 17,000      
Percentage of unrealized loss position for less than 12 months     1.60%        
Percentage of unrealized loss position for greater than 12 months     10.10%        
Debt Securities, Available-for-Sale, Realized Gain (Loss)     $ 0        
U.S. Agency              
Investment Securities:              
Held to maturity securities, fair value 2,216,000   2,216,000   2,121,000    
Held to maturity, allowance for credit losses $ 0   $ 0        
Unrealized loss position for greater than 12 months, Number of positions | position 6   6        
U.S. Agency mortgage-backed securities              
Investment Securities:              
Held to maturity securities, fair value $ 25,553,000   $ 25,553,000   22,213,000    
Held to maturity, allowance for credit losses $ 0   $ 0        
Unrealized loss position for greater than 12 months, Number of positions | position 130   130        
Municipal              
Investment Securities:              
Held to maturity securities, fair value $ 30,783,000   $ 30,783,000   29,990,000    
Held to maturity, allowance for credit losses $ 2,000   $ 2,000 2,000 2,000 2,000 2,000
Unrealized loss position for greater than 12 months, Number of positions | position 26   26        
Corporate bonds              
Investment Securities:              
Charge-off resulted from sale of securities     $ 491,000        
Available for Sale Securities, allowance for credit losses $ 360,000   $ 360,000 $ 926,000 $ 926,000 $ 360,000 $ 926,000
Unrealized loss position for less than 12 months, Number of positions | position 4   4        
Unrealized loss position for greater than 12 months, Number of positions | position 74   74        
Subordinated debt investment              
Investment Securities:              
Charge-off resulted from sale of securities   $ 491,000          
Provision for credit losses recovery recognized   $ 435,000          
Standard & Poor's, AAA Rating [Member]              
INVESTMENT SECURITIES              
Portfolio rated 57.20%   57.20%   55.90%    
Securities rated below A              
INVESTMENT SECURITIES              
Portfolio rated 14.50%   14.50%   15.10%    
Maximum              
Investment Securities:              
The weighted average duration of the total investment securities portfolio     60 months