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Summary of significant accounting policies - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Office
Number of full-service community banking offices | Office	27
Future minimum lease commitments	$ 3,100
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01
Reclassification related to adoption of ASU 2016-01	$ 2

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The number of full-service community banking offices.

+ References

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Amount of minimum lease payments for capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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