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Retirement Plans - Schedule of Target Allocation and Expected Long-Term Rate of Return by Asset Category (Detail) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets at Year-end | 100.00% | 100.00%
Equity Securities in Financial Institutions [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation, minimum | 20.00% |
Target Allocation, maximum | 50.00% |
Percentage of Plan Assets at Year-end | 47.50% | 48.20%
Total Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation, minimum | 30.00% |
Target Allocation, maximum | 60.00% |
Percentage of Plan Assets at Year-end | 52.10% | 47.00%
Money Market Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation, minimum | 20.00% |
Target Allocation, maximum | 30.00% |
Percentage of Plan Assets at Year-end | 0.40% | 4.80%

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