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Earnings per Share - Reconciliation of Shares Outstanding for Basic and Diluted Earnings per Share (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]      
Weighted average shares outstanding 17,037 17,197 17,614
Less: Unallocated ESOP shares (378) (412) (446)
Unallocated Incentive award shares and shares held by deferred compensation plan (59) (98) (97)
Average basic shares outstanding 16,600 16,687 17,071
Average basic shares outstanding 16,600 16,687 17,071
Add: Effect of dilutive securities:      
Incentive awards and shares held by deferred compensation plan 211 110 86
Average diluted shares outstanding 16,811 16,797 17,157