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Other Benefit Plans (Schedule of Employees Eligible to Participate in Employee Stock Purchase Plan) (Detail) - $ / shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract] |  |  |  |  |
ESPP shares purchased | 1,940 | 2,289 | 4,465 | 4,162 | 3,432
Average purchase price per share |  |  | $ 18.520 | $ 15.865 | $ 15.318

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