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Employee benefit plans - Salaries and Employee Benefits Expense - Investment Percentages (Details) - Pension Benefits - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure |  |
Amount of company's common stock included in equity securities | $ 0 | $ 0
Industry sector | Maximum |  |
Defined Benefit Plan Disclosure |  |
Maximum diversification (as a percent) | 20.00% |
Common equity securities |  |
Defined Benefit Plan Disclosure |  |
Maximum diversification (as a percent) | 10.00% |
Cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan, target allocation (as a percent) | 10.00% |
Fixed income |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan, target allocation (as a percent) | 40.00% |
Equities |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan, target allocation (as a percent) | 50.00% |

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- Definition The value of the company stock that is included in the target allocation in the defined benefit plan. + References No definition available. + Details
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- Definition The maximum diversification percentage for the defined benefit plan. + References No definition available. + Details
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- Definition Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + References No definition available. + Details
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