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Summary of significant accounting policies - Additional Information (Details)
 12 Months Ended
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