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Summary of significant accounting policies - Additional Information (Details) $ in Thousands | 3 Months Ended
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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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- Definition 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 + Details
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