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Investment securities (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 08, 2021 USD ($) shares | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of investment securities held |  | 168 |  |
Other-than-temporary impairments recognized | $ |  | $ 0 | $ 0 | $ 0
Value of common stock | $ |  | $ 14,341 | 14,431 |
Gain on sale of investments | $ |  |  | $ 918 | $ 23
Visa Class B stock |  |  |  |
Number of shares sold | shares | 44,982 |  |  |
Purchase price | $ | $ 12,200 |  |  |
Number of shares purchased | shares | 73,333 |  |  |
Number of shares redeemed | shares | 28,351 |  |  |
U.S. Treasury securities |  |  |  |
Number of investment securities held |  | 42 |  |
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |  |  |
Number of investment securities held |  | 23 |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 7 |  |
Corporate Bonds |  |  |  |
Number of investment securities held |  | 5 |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 1 |  |
State and Municipals, Taxable |  |  |  |
Number of investment securities held |  | 35 |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 8 |  |
State and Municipals, Tax-exempt |  |  |  |
Number of investment securities held |  | 63 |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 18 |  |

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