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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |
Net income | $ 100,038 | $ 101,530 | $ 100,109 | $ 98,453 | $ 105,271 | $ 102,962 | $ 301,677 | $ 306,686
Average shares outstanding (in shares) | 199,380 |  |  | 202,526 |  |  | 200,300 | 202,921
Effect of common stock options (in shares) | 81 |  |  | 124 |  |  | 130 | 147
Average diluted shares outstanding (in shares) | 199,461 |  |  | 202,650 |  |  | 200,430 | 203,068
Basic earnings per share (in dollars per share) | $ 0.50 |  |  | $ 0.49 |  |  | $ 1.51 | $ 1.51
Diluted earnings per share (in dollars per share) | $ 0.50 |  |  | $ 0.49 |  |  | $ 1.51 | $ 1.51

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