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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 142,494 | $ 27,585
12 Months or More, Fair Value | 243 | 284
Less Than 12 Months, Unrealized Losses | 4,897 | 202
12 Months or More, Unrealized Losses | 1 | 1
Total, Fair Value | 142,737 | 27,869
Total, Unrealized Losses | 4,898 | 203
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 28,025 | 9,246
Less Than 12 Months, Unrealized Losses | 1,251 | 30
Total, Fair Value | 28,025 | 9,246
Total, Unrealized Losses | 1,251 | 30
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 30,795 | 6,786
Less Than 12 Months, Unrealized Losses | 779 | 37
Total, Fair Value | 30,795 | 6,786
Total, Unrealized Losses | 779 | 37
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 82,687 |
12 Months or More, Fair Value | 243 |
Less Than 12 Months, Unrealized Losses | 2,854 |
12 Months or More, Unrealized Losses | 1 |
Total, Fair Value | 82,930 |
Total, Unrealized Losses | 2,855 |
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 11,553
12 Months or More, Fair Value |  | 284
Less Than 12 Months, Unrealized Losses |  | 135
12 Months or More, Unrealized Losses |  | 1
Total, Fair Value |  | 11,837
Total, Unrealized Losses |  | $ 136
Corporate debt securities |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 987 |
Less Than 12 Months, Unrealized Losses | 13 |
Total, Fair Value | 987 |
Total, Unrealized Losses | $ 13 |

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