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Investment securities - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) security shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Number of investment securities held | 26 |  |
Other-than-temporary impairments recognized | $ | $ 0 | $ 0 | $ 0
Visa Class A stock |  |  |
Conversion ratio of common stock | 1.6228 |  |
Shares to be issued following resolution of Visa litigation | shares | 72,997 |  |
Visa Class B stock |  |  |
Shares held | shares | 44,982 |  |
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |  |
Number of investment securities held | 6 |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 2 |  |
State and Municipals, Taxable |  |  |
Number of investment securities held | 8 |  |
State and Municipals, Tax-exempt |  |  |
Number of investment securities held | 12 |  |

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