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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 |  |

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