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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Weighted average shares outstanding 51,227 48,156 50,666 46,189
Less: Unallocated ESOP shares (501) (378) (509) (334)
Unallocated incentive award shares and shares held by deferred compensation plan (39) (60) (42) (50)
Average basic shares outstanding 50,687 47,718 50,115 45,805
Add: Effect of dilutive securities:        
Incentive awards and shares held by deferred compensation plan 603 986 613 981
Average diluted shares outstanding 51,290 48,704 50,728 46,786