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Investment securities - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($)
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Carrying value of securities pledged |  |  |  |  | us-gaap:AssetPledgedAsCollateralMember | us-gaap:AssetPledgedAsCollateralMember
Number of investment securities held |  |  |  |  | 209 |
Other-than-temporary impairments recognized | $ |  |  |  |  | $ 0 |
Collateral Pledged |  |  |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Carrying value of securities pledged | $ |  |  |  |  | $ 164,516 | $ 163,936
State and Municipals, Tax-exempt |  |  |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 118 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  | 23 |
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 |  |  |  |  | 38 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  | 30 |
Other-than-temporary impairments recognized | $ | $ 0 | $ 0 | $ 0 | $ 0 |  |
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |  |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 44 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  | 28 |
U.S. Treasuries |  |  |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |  |  |
Number of investment securities held |  |  |  |  | 9 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  |  |  | 6 |

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