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Earnings per Share - Reconciliation of Shares Outstanding for Basic and Diluted Earnings per Share (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Weighted average shares outstanding 50,099 44,227
Less: Unallocated ESOP shares (517) (290)
Unallocated incentive award shares and shares held by deferred compensation plan (56) (57)
Average basic shares outstanding 49,526 43,880
Add: Effect of dilutive securities:    
Incentive awards and shares held by deferred compensation plan 624 966
Average diluted shares outstanding 50,150 44,846