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Merger accounting - Schedule of Pro Forma Condensed Combined Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |
Net interest income after loan loss provision | $ 52,734 | $ 52,917
Noninterest income | 16,080 | 16,287
Noninterest expense | 52,295 | 49,827
Net income | $ 16,519 | $ 19,377
Net income per share | $ 2.19 | $ 2.55

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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