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Investment securities - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Available-for-sale and Held-to-maturity securities |  |  |
Unrealized gains, net | $ | $ 2,568 | $ 977 |
Net of deferred income taxes | $ | 683 | 260 |
Proceeds from sale of available-for-sale investment securities | $ | $ 0 | 0 | $ 27,408
Gross realized gains | $ |  |  | 623
Gross realized losses | $ |  |  | 0
Number of investment securities held | 187 |  |
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 | 104 |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 88 |  |
U.S. Treasuries |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 7 |  |
U.S. Treasuries | State and Municipals, Tax-exempt |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 8 |  |
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 | 37 |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 35 |  |
Mortgage-backed Securities, Issued by Government Agencies | United States |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 38 |  |
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 | 33 |  |

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