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Income taxes - Components of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for loan losses	$ 3,981	$ 5,586
Defined benefit plan	1,392	2,431
Deferred compensation	499	705
Capital loss carry forward		211
Investment securities available-for-sale	260
Other	370	706
Total	6,502	9,639
Deferred tax liabilities:
Premises and equipment, net	815	981
Merger related accounting	1,243	2,165
Investment securities available-for-sale		197
Other	538	725
Total	2,596	4,068
Net deferred tax asset	$ 3,906	$ 5,571

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