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Benefit Plans - Schedule of Changes in Plan Benefit Obligation and Fair Value of Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Changes in Plan Assets    
Fair value of plan assets, beginning of year $ 4,368  
Fair value of assets, end of year 4,264 $ 4,368
Defined Benefit Pension Plan [Member]    
Change in Benefit Obligation    
Benefit obligation, beginning of year 7,729 5,501
Service cost 446 347
Interest cost 302 269
Actuarial (gain) loss (271) 1,769
Benefits paid (99) (157)
Benefit obligation, end of year 8,107 7,729
Changes in Plan Assets    
Fair value of plan assets, beginning of year 4,368 4,329
Actual return on plan assets (5) 196
Benefits paid (99) (157)
Fair value of assets, end of year 4,264 4,368
Funded Status, end of year (3,843) (3,361)
Amount Recognized in Other Liabilities $ (3,843) $ (3,361)