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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Weighted average shares outstanding (shares) 50,701 47,266 32,490
Less: Unallocated ESOP shares (shares) (493) (435) (311)
Unallocated incentive award shares and shares held by deferred compensation plan (shares) (42) (58) (66)
Average basic shares outstanding (shares) 50,166 46,773 32,113
Add: Effect of dilutive securities:      
Incentive awards and shares held by deferred compensation plan (shares) 580 884 1,012
Average diluted shares outstanding (shares) 50,746 47,657 33,125