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Cash and stock-based compensation plans (Details) - Directors [Member] - Restricted Stocks [Member] | 12 Months Ended
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Dec. 31, 2017 USD ($) NumberofShare shares | Dec. 31, 2016 USD ($) NumberofShare | Dec. 31, 2015 USD ($) NumberofShare
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of Shares, Outstanding at Beginning | NumberofShare | 96,900 | 96,321 | 78,336
Number of Shares, Granted | NumberofShare | 57,000 | 57,000 | 57,000
Number of Shares, Vested | NumberofShare | (61,950) | (56,421) | (39,015)
Number of Shares, Outstanding at End | NumberofShare | 91,950 | 96,900 | 96,321
Number of Shares, Expected to vest | shares | 91,950 |  |
Weighted average grand date fair value Outstanding at beginning | $ | $ 27.86 | $ 30.62 | $ 24.37
Weighted average grand date fair value, Granted | $ | 27.80 | 24.14 | 33.78
Weighted average grand date fair value, Vested | $ | 28.50 | 28.80 | 22.69
Weighted average grand date fair value, Outstanding at End | $ | $ 27.40 | $ 27.86 | $ 30.62

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