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Investment securities - Additional Information (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) security | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) security
Available-for-sale and Held-to-maturity securities |  |  |
Carrying value of securities pledged | $ | $ 154,673 |  | $ 180,478
Number of investment securities held | 24 |  | 88
State and Municipals, Tax-exempt |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 11 |  | 38
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
Number of securities in continuous unrealized loss positions 12 months or longer | 1 |  | 1
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 |  |  | 12
Number of securities in continuous unrealized loss positions 12 months or longer |  |  | 7
Other-than-temporary impairments recognized | $ | $ 0 | $ 0 |
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of investment securities held | 13 |  | 36
Number of securities in continuous unrealized loss positions 12 months or longer | 5 |  |

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