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Executive Benefits Agreements and Employees Savings Plans - Executive Benefit Agreements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Compensation Related Costs [Abstract]    
Total undiscounted death benefits $ 4,501 $ 6,417
Total accrued death benefits 4,040 4,054
Total undiscounted executive benefits 913 1,900
Total accrued executive benefits $ 564 $ 1,363