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Investment Securities - Additional information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
position
security
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
position
security
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
INVESTMENT SECURITIES:                
Investment trading account $ 5,000,000   $ 5,000,000          
Cash held in the account available for future security purchases 774,000   774,000          
Gross investment losses       $ 0        
Gross investment gains       0        
Accrued interest receivable on held to maturity debt securities 427,000   427,000   $ 403,000      
Proceeds from sale of investment securities - available for sale 0 $ 0 0 935,000        
Book value of securities available for sale and held to maturity 142,300,000   $ 142,300,000   $ 125,800,000      
Premium percentage on mortgage backed securities purchased     100.70%          
The weighted average duration of the total investment securities portfolio     44 months 18 days   50 months 9 days      
Accrued interest receivable on available for sale debt securities $ 1,100,000   $ 1,100,000   $ 833,000      
Number of available for sale debt securities in non accrual status | security 0   0          
Charge-off of a non-performing security totaling $ 1,000,000   $ 1,000,000 491,000        
Available-for-Sale debt securities in non-accrual         1,000,000      
Percentage of unrealized loss position for less than 12 months     7.40%          
Percentage of unrealized loss position for greater than 12 months     10.60%          
Available for sale securities, allowance for credit losses 0 360,000 $ 0 360,000 360,000 $ 1,000,000 $ 360,000 $ 926,000
Carrying value of equity securities without readily determinable fair values 600,000   600,000   600,000      
Investment securities held to maturity, Allowance for credit losses (94,000) (88,000) (94,000) (88,000) (89,000) (85,000) (100,000) (37,000)
Held to maturity debt securities in non-accrual $ 0   $ 0   0      
U.S. Agency                
INVESTMENT SECURITIES:                
Unrealized loss position for greater than 12 months, Number of positions | position 6   6          
Investment securities held to maturity, Allowance for credit losses $ 0   $ 0          
U.S. Agency mortgage-backed securities                
INVESTMENT SECURITIES:                
Unrealized loss position for less than 12 months, Number of positions | position 3   3          
Unrealized loss position for greater than 12 months, Number of positions | position 129   129          
Investment securities held to maturity, Allowance for credit losses $ 0   $ 0          
Municipal                
INVESTMENT SECURITIES:                
Unrealized loss position for greater than 12 months, Number of positions | position 22   22          
Investment securities held to maturity, Allowance for credit losses $ (1,000) (2,000) $ (1,000) (2,000) (2,000) (2,000) (2,000) (2,000)
Corporate bonds                
INVESTMENT SECURITIES:                
Charge-off of a non-performing security totaling $ 1,000,000   $ 1,000,000 491,000        
Unrealized loss position for less than 12 months, Number of positions | position 5   5          
Unrealized loss position for greater than 12 months, Number of positions | position 44   44          
Available for sale securities, allowance for credit losses   $ 360,000   $ 360,000 $ 360,000 $ 1,000,000 $ 360,000 $ 926,000
Revolving credit facility                
INVESTMENT SECURITIES:                
Collateral amount $ 3,800,000   $ 3,800,000          
Standard & Poor's, AAA Rating                
INVESTMENT SECURITIES                
Portfolio rated 1.00%   1.00%   59.20%      
Standard & Poor's, AA Rating                
INVESTMENT SECURITIES                
Portfolio rated 76.10%   76.10%   72.80%      
Securities rated below A                
INVESTMENT SECURITIES                
Portfolio rated 12.60%   12.60%   14.70%      
Maximum                
INVESTMENT SECURITIES:                
The weighted average duration of the total investment securities portfolio     60 months