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Investment securities - Additional Information (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
Available-for-sale and Held-to-maturity securities |  |
Carrying value of securities pledged | $ | $ 165,205 | $ 144,750
Number of investment securities held | 74 | 163
US Government Agency and Sponsored Enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Number of investment securities held | 29 |
Number of securities in continuous unrealized loss positions 12 months or longer | 10 |
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Number of investment securities held | 11 | 107
Number of securities in continuous unrealized loss positions 12 months or longer | 4 |
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Number of investment securities held | 1 | 2
Credit Concentration Risk | Total Stockholders' Equity | US Government Agency and Sponsored Enterprises | Minimum |  |
Available-for-sale and Held-to-maturity securities |  |
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer | 10.00% | 10.00%
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Number of investment securities held |  | 22
Number of securities in continuous unrealized loss positions 12 months or longer |  | 9
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Number of investment securities held | 31 | 30
Number of securities in continuous unrealized loss positions 12 months or longer | 14 |
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Number of investment securities held | 2 | 2

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