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Investment Securities - Additional information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
security
position
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
security
position
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Jan. 01, 2023
USD ($)
Investment Securities:              
Proceeds from sales of investment securities - available for sale $ 0 $ 0 $ 0 $ 0      
Book value of securities available for sale and held to maturity 133,639,000   $ 133,639,000   $ 134,002,000    
Premium percentage on mortgage backed securities purchased     100.80%        
The weighted average duration of the total investment securities portfolio     54 months 21 days   56 months    
Unrealized loss on equity securities     $ 0        
Held to maturity, allowance for credit losses 109,000   109,000     $ 83,000 $ 114,000
Accrued interest receivable on held to maturity debt securities 363,000   363,000        
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 $ 968,000   $ 968,000        
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     5.50%        
Percentage of unrealized loss position for greater than 12 months     14.60%        
Assets 1,345,721,000   $ 1,345,721,000   $ 1,363,874,000    
Net income (187,000) $ 1,981,000 1,328,000 $ 4,399,000      
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 3   3        
Unrealized loss position for greater than 12 months, Number of positions | position 11   11        
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 40   40        
Unrealized loss position for greater than 12 months, Number of positions | position 112   112        
Municipal              
Investment Securities:              
Held to maturity, allowance for credit losses $ 2,000   $ 2,000     $ 3,000 3,000
Unrealized loss position for less than 12 months, Number of positions | position 11   11        
Unrealized loss position for greater than 12 months, Number of positions | position 47   47        
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 39   39        
Unrealized loss position for greater than 12 months, Number of positions | position 54   54        
AAA/AA/A.              
INVESTMENT SECURITIES              
Portfolio rated 53.00%   53.00%   52.50%    
Securities rated below A              
INVESTMENT SECURITIES              
Portfolio rated 14.20%   14.20%   14.70%    
Maximum              
Investment Securities:              
The weighted average duration of the total investment securities portfolio     60 months