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Investment Securities - Additional information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
position
security
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
position
security
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jan. 01, 2023
USD ($)
INVESTMENT SECURITIES              
Gross investment losses   $ 5,000   $ 5,000      
Investment Securities:              
Proceeds from sales of investment securities - available for sale $ 0 1,500,000 $ 0 1,519,000      
Gross investment gains   5,000   5,000      
Gross investment losses   5,000   5,000      
Book value of securities available for sale and held to maturity 130,945,000   $ 130,945,000   $ 134,002,000    
Premium percentage on mortgage backed securities purchased     100.80%        
The weighted average duration of the total investment securities portfolio     53 months 24 days   56 months    
Unrealized loss on equity securities     $ 0        
Held to maturity, allowance for credit losses 32,000   32,000     $ 109,000 $ 114,000
Accrued interest receivable on held to maturity debt securities 417,000   417,000        
Held to maturity debt securities in non-accrual 0   0        
Available for Sale Securities, allowance for credit losses 926,000   926,000        
Accrued interest receivable on available for sale debt securities $ 1,200,000   $ 1,200,000        
Number of available for sale debt securities in non accrual status | security 1   1        
Available-for-Sale debt securities in non-accrual $ 926,000   $ 926,000        
Percentage of unrealized loss position for less than 12 months     3.30%        
Percentage of unrealized loss position for greater than 12 months     14.70%        
Assets 1,361,789,000   $ 1,361,789,000   $ 1,363,874,000    
Net income 647,000 $ 2,102,000 1,975,000 $ 6,501,000      
Unpaid interest     17,000        
Signature Bank              
Investment Securities:              
Assets         110,400,000,000    
Net income         $ 1,300,000,000    
U.S. Agency              
Investment Securities:              
Held to maturity, allowance for credit losses $ 0   $ 0        
Unrealized loss position for less than 12 months, Number of positions | position 1   1        
Unrealized loss position for greater than 12 months, Number of positions | position 13   13        
U.S. Agency mortgage-backed securities              
Investment Securities:              
Held to maturity, allowance for credit losses $ 0   $ 0        
Unrealized loss position for less than 12 months, Number of positions | position 12   12        
Unrealized loss position for greater than 12 months, Number of positions | position 147   147        
Municipal              
Investment Securities:              
Held to maturity, allowance for credit losses $ 2,000   $ 2,000     $ 2,000 3,000
Unrealized loss position for greater than 12 months, Number of positions | position 57   57        
Corporate bonds.              
Investment Securities:              
Held to maturity, allowance for credit losses             $ 111,000
Available for Sale Securities, allowance for credit losses $ 926,000   $ 926,000        
Unrealized loss position for less than 12 months, Number of positions | position 14   14        
Unrealized loss position for greater than 12 months, Number of positions | position 79   79        
AAA/AA/A.              
INVESTMENT SECURITIES              
Portfolio rated 53.80%   53.80%   52.50%    
Securities rated below A              
INVESTMENT SECURITIES              
Portfolio rated 14.50%   14.50%   14.70%    
Maximum              
Investment Securities:              
The weighted average duration of the total investment securities portfolio     60 months