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Investment securities - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 security | Mar. 31, 2017 USD ($) security | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) security
Available-for-sale and Held-to-maturity securities |  |  |  |
Carrying value of securities pledged | $ |  | $ 142,335 |  | $ 144,750
Number of investment securities held |  | 150 |  | 163
State and Municipals, Tax-exempt |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |
Number of investment securities held |  | 93 |  | 107
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 |  |  |  | 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 |  | 23 |  | 22
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  | 9
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 |  | 28 |  | 30
Number of securities in continuous unrealized loss positions 12 months or longer |  | 8 |  |
U.S. Treasury securities |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |
Number of investment securities held | 6 |  |  | 2

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