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Investment securities - Restricted Investment In Stock (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Available-for-sale and Held-to-maturity securities |  |  |
Unrealized gains (loss), net | $ | $ 1,450 | $ (2,568) |
Net of deferred income taxes | $ | 385 | 683 |
Proceeds from sale of available-for-sale investment securities | $ | 9,677 | 0 |
Gross realized gains | $ | 66 |  |
Gross realized losses | $ | $ 43 |  |
Number of investment securities held | 70 |  |
Other-than-temporary impairments recognized | $ | $ 0 | $ 0 | $ 0
State and Municipals, Tax-exempt |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 6 |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 2 |  |
State and Municipals, Taxable |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 22 |  |
U.S. government-sponsored enterprises state and municipals |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer | 10.00% | 10.00% |
Number of investment securities held | 18 |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 16 |  |
Mortgage-backed Securities, Issued by Government Agencies | United States |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 24 |  |
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 17 |  |

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