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Summary of significant accounting policies - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) Office | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Date of incorporation | Nov. 30, 2013 |  |
Date of Merger |  | Jun. 28, 2013 |
Effective date of Merger Agreement | Dec. 01, 2013 |  |
Number of full-service community banking offices | Office | 27 |  |
Reclassification of prior period items amounts effect on net income | $ 0 |  |
Debt service coverage ratio | 1.2 |  |
Non performing loans past due period for Non-accrual status | 90 days |  |
Maximum days of consumer loans past due | 120 days |  |
Impairment losses on intangible assets | $ 0 | $ 0 | $ 0
Commitments subject to undue credit risk | 0 |  |
Advertising expense | $ 942,000 | 972,000 | 736,000
Income tax benefit recognition threshold | 50.00% |  |
Unrecognized tax benefit or accrued interest and penalties | $ 0 | $ 0 | $ 0
Income tax examination description | the Company recognizes accrued interest and penalties assessed as a result of a taxing authority examination through income tax expense. The Company files consolidated income tax returns in the United States of America and various states' jurisdictions. With limited exception, the Company is no longer subject to federal and state income tax examinations by taxing authorities for years before 2014. |  |
Minimum |  |  |
Contractual terms | 6 months |  |
Maximum |  |  |
Finite useful life of intangible assets | 10 years |  |
Lease contracts as a percent of current assets | 1.00% |  |
Commercial Real Estate |  |  |
Maximum loan to value percentage | 80.00% |  |
Residential Mortgage | Maximum |  |  |
Maximum amortization period | 30 years |  |

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