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Investment Securities - Additional information (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
position
security
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jan. 01, 2023
USD ($)
Investment Securities:        
Proceeds from sales of investment securities - available for sale $ 0 $ 0    
Book value of securities available for sale and held to maturity $ 131,913,000   $ 134,002,000  
Premium percentage on mortgage backed securities purchased 100.90%      
Consolidated investment securities portfolio modified, years 54 months 18 days   56 months  
Unrealized loss on equity securities $ 0      
Held to maturity, allowance for credit losses 83,000     $ 114,000
Accrued interest receivable on held to maturity debt securities 411,000      
Held to maturity debt securities in non-accrual 0      
Available for Sale Securities, allowance for credit losses 926,000      
Accrued interest receivable on available for sale debt securities $ 1,200,000      
Number of available for sale debt securities in non accrual status | security 1      
Available-for-Sale debt securities in non-accrual $ 926,000      
Percentage of unrealized loss position for less than 12 months 4.40%      
Percentage of unrealized loss position for greater than 12 months 12.80%      
Assets $ 1,345,957,000   $ 1,363,874,000  
Net income 1,515,000 $ 2,418,000    
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      
Unrealized loss position for less than 12 months, Number of positions | position 4      
Unrealized loss position for greater than 12 months, Number of positions | position 10      
U.S. Agency mortgage-backed securities        
Investment Securities:        
Unrealized loss position for less than 12 months, Number of positions | position 45      
Unrealized loss position for greater than 12 months, Number of positions | position 104      
Municipal        
Investment Securities:        
Held to maturity, allowance for credit losses $ 3,000     3,000
Unrealized loss position for less than 12 months, Number of positions | position 11      
Unrealized loss position for greater than 12 months, Number of positions | position 47      
Corporate bonds.        
Investment Securities:        
Held to maturity, allowance for credit losses       $ 111,000
Available for Sale Securities, allowance for credit losses $ 926,000      
Unrealized loss position for less than 12 months, Number of positions | position 45      
Unrealized loss position for greater than 12 months, Number of positions | position 49      
AAA/AA/A.        
INVESTMENT SECURITIES        
Portfolio rated 52.50%   52.50%  
Securities rated below A        
INVESTMENT SECURITIES        
Portfolio rated 14.20%   14.70%  
Maximum        
Investment Securities:        
Consolidated investment securities portfolio modified, years 60 months