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Earnings per Share - Reconciliation of Shares Outstanding for Basic and Diluted Earnings per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Weighted average shares outstanding (in shares) 60,358 50,701 47,266
Less: Unallocated ESOP shares (in shares) (426) (493) (435)
Unallocated incentive award shares and shares held by deferred compensation plan (in shares) (13) (42) (58)
Average basic shares outstanding (in shares) 59,919 50,166 46,773
Add: Effect of dilutive securities:      
Incentive awards and shares held by deferred compensation plan (in shares) 153 580 884
Average diluted shares outstanding (in shares) 60,072 50,746 47,657