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Nature of Operations and Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings per Common Share (EPS) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Net income $ 115,209 $ 100,109
Average shares outstanding (in shares) 198,657 201,210
Effect of common stock options (in shares) 195 180
Average diluted shares outstanding (in shares) 198,852 201,390
Basic earnings per share (in dollars per share) $ 0.58 $ 0.50
Diluted earnings per share (in dollars per share) $ 0.58 $ 0.50