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Summary of Significant Accounting Policies - Reconciliation of Numerator and Denominator of Basic Earnings Per Share with that of Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share [Abstract]                      
Distributed earnings allocated to common stock                 $ 211,141 $ 200,156 $ 195,167
Undistributed earnings allocated to common stock                 252,428 172,006 170,267
Net earnings allocated to common shareholders                 $ 463,569 $ 372,162 $ 365,434
Average common shares outstanding 140,481,000 141,548,000 142,207,000 142,331,000 135,236,000 135,158,000 135,138,000 134,809,000 141,497,205 134,947,592 134,505,058
Dilutive effect of stock compensation                 330,155 277,825 248,762
Average diluted shares outstanding 140,980,000 141,961,000 142,444,000 142,698,000 135,732,000 135,505,000 135,315,000 135,121,000 141,827,360 135,225,417 134,753,820
Earnings per basic common share $ 0.92 $ 0.92 $ 0.85 $ 0.59 $ 0.7 $ 0.7 $ 0.71 $ 0.64 $ 3.28 $ 2.76 $ 2.72
Earnings per diluted common share $ 0.91 $ 0.92 $ 0.85 $ 0.59 $ 0.69 $ 0.7 $ 0.71 $ 0.64 $ 3.27 $ 2.75 $ 2.71