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Merger accounting - Calculation of Consideration Effectively Transferred (Parenthetical) (Details) |  | 12 Months Ended
--- | --- | ---
Nov. 30, 2013 $ / shares shares | Dec. 31, 2015
Business Acquisition [Line Items] |  |
Common stock exchange ratio |  | 1.3636
Penseco Financial Services Corp [Member] |  |
Business Acquisition [Line Items] |  |
Price per share | $ / shares | $ 34.50 |
Common stock exchange ratio | 1.3636 |
Common shares to be retired | shares | 9,928 |

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- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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