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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Weighted average shares outstanding 47,266 32,490 23,481
Less: Unallocated ESOP shares (435) (311) (344)
Unallocated Incentive award shares and shares held by deferred compensation plan (58) (66) (44)
Average basic shares outstanding 46,773 32,113 23,093
Add: Effect of dilutive securities:      
Incentive awards and shares held by deferred compensation plan 884 1,012 433
Average diluted shares outstanding 47,657 33,125 23,526