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Investment securities - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
security
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Other-than-temporary impairments recognized $ 0    
Common Stock, Value, Issued $ 14,423   $ 14,431
Visa Class A stock      
Conversion ratio of common stock 1.6228    
Visa Class B stock      
Shares held | shares 44,982    
Common Stock, Value, Issued $ 0   0
Federal Home Loan Bank of Pittsburgh (FHLB)      
Common Stock, Value, Issued 5,419   5,355
Atlantic Community Bankers Bank (ACBB)      
Common Stock, Value, Issued 42   $ 42
U.S. government-sponsored enterprises state and municipals      
Other-than-temporary impairments recognized $ 0 $ 0  
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer 10.00%   10.00%
Mortgage-backed Securities, U.S. government-sponsored enterprises      
Number of securities in continuous unrealized loss position | security 15    
Number of securities in continuous unrealized loss positions 12 months or longer | security 2    
State and Municipals, Taxable      
Number of securities in continuous unrealized loss position | security 28    
State and Municipals, Taxable | Corporate Bonds      
Number of securities in continuous unrealized loss position | security 2    
State and Municipals, Tax-exempt      
Number of securities in continuous unrealized loss position | security 44