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Summary of significant accounting policies - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2014 Office
Accounting Policies [Abstract] |
Date of incorporation | Nov. 30, 2013
Date of Merger | Jun. 28, 2013
Effective date of Merger Agreement | Dec. 01, 2013
Number of full-service community banking offices | 26

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