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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, 2018 USD ($) security | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 | Dec. 31, 2017 USD ($)
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Number of investment securities held |  | 198 |  |  |  |
Other-than-temporary impairments recognized | $ |  | $ 0 |  |  |  |
Collateral Pledged |  |  |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Carrying value of securities pledged | $ |  | $ 156,522 |  |  |  | $ 163,936
State and Municipals, Tax-exempt |  |  |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Number of investment securities held |  | 114 |  |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 8 |  |  |  |
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 |  | 36 |  |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 20 |  |  |  |
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 |  | 40 |  |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 16 |  |  |  |
U.S. Treasuries |  |  |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Number of investment securities held | 8 |  |  |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer |  | 1 |  |  |  |

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