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Investment securities - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Available-for-sale and Held-to-maturity securities |  |  |
Unrealized gains, net | $ | $ 977 | $ 360 |
Net of deferred income taxes | $ | 260 | 193 |
Proceeds from the sale of investment securities available-for-sale | $ | 0 | 27,408 | $ 81,983
Gross realized gains | $ |  | 623 | 1,189
Gross realized losses | $ |  | 0 | 0
Gross realized gains or losses | $ | 0 | 623 | 1,189
Carrying value of securities pledged | $ | $ 163,936 | $ 144,750 |
Number of investment securities held | 186 |  |
State and Municipals, Tax-exempt |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 103 |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 7 |  |
State and Municipals, Taxable |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 1 |  |
U.S. Treasuries |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 1 |  |
U.S. Treasuries | State and Municipals, Tax-exempt |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 7 |  |
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 | 35 |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 20 |  |
Other-than-temporary impairments recognized | $ | $ 0 | $ 0 | $ 0
Mortgage-backed Securities, Issued by Government Agencies | United States |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 40 |  |

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- Definition The net unrealized gain or (loss) on available-for-sale securities which is net of deferred income taxes. + References No definition available. + Details
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