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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%

X

- 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

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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