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Merger accounting - Schedule of Pro Forma Condensed Combined Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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

Business Acquisitions Pro Forma Earnings Per Share Basic And Diluted

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- Definition

Business Acquisitions Pro Forma Noninterest Expense

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- Definition

Business Acquisitions Pro Forma Noninterest Income

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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

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the 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

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