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Summary of significant accounting policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) Office	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Number of full-service community banking offices | Office	27
Number of limited purpose banking offices	$ 1
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
Advertising expense	$ 720,000	942,000	972,000
Income tax benefit recognition threshold	50.00%
Unrecognized tax benefit or accrued interest and penalties	$ 0	$ 0	$ 0
Minimum
Contractual terms	6 months
Maximum
Finite useful life of intangible assets	10 years
Commercial Real Estate
Maximum loan to value percentage	80.00%
Residential Mortgage | Maximum
Maximum amortization period	30 years
Accounting Standards Update 2016-02 | Restatement Adjustment
Lease liabilities for operating leases				$ 5,500,000
Right-of-use assets				$ 5,500,000
Retained Earnings | Accounting Standards Update 2018-02
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 1,101,000
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02
Cumulative Effect of New Accounting Principle in Period of Adoption					$ (1,101,000)

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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