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Income Taxes - Reconciliation of Income Tax Expense to the Amount Computed by Applying the Statutory Federal Income Tax Rate (Detail) - USD ($)
$ 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
Income Tax Disclosure [Abstract]                      
Tax on income before taxes at statutory federal rate                 $ 122,514 $ 97,562 $ 97,399
Tax Jurisdiction of Domicile [Extensible Enumeration]                 State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] State and Local Jurisdiction [Member]
State income taxes net of federal tax benefits                 $ 17,137 $ 13,591 $ 11,847
Low income housing (Amount)                 (19,030) (15,814) (13,557)
Other (Amount)                 (1,303) (706) (1,639)
Nontaxable and nondeductible items (Amount)                 (2,301) (2,439) (2,974)
Other                 1,780 (611) 6,416
Total income taxes $ 31,068 $ 33,735 $ 31,367 $ 22,627 $ 26,651 $ 24,649 $ 18,878 $ 21,405 $ 118,797 $ 91,583 $ 97,492
Tax on income before taxes at statutory federal rate, rate                 21.00% 21.00% 21.00%
State income taxes net of federal tax benefits, rate                 2.90% 2.90% 2.60%
Low income housing (Percent)                 (3.30%) (3.40%) (2.90%)
Other (Percent)                 (0.20%) (0.10%) (0.40%)
Nontaxable and nondeductible items (Percent)                 (0.40%) (0.50%) (0.60%)
Other (Percent)                 0.40% (0.20%) 1.30%
Income taxes, rate                 20.40% 19.70% 21.00%