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Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
 [1]
Sep. 30, 2025
 [1]
Jun. 30, 2025
 [1]
Mar. 31, 2025
 [1]
Dec. 31, 2024
 [1]
Sep. 30, 2024
 [1]
Jun. 30, 2024
 [1]
Mar. 31, 2024
 [1]
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]                      
Net Income $ 128,828 $ 130,748 $ 120,721 $ 84,306 $ 94,408 $ 95,267 $ 96,507 $ 86,814 $ 464,603 $ 372,996 $ 366,313
Available for sale ("AFS") securities:                      
Change in net unrealized gains on AFS securities arising during the period                 117,563 24,251 98,627
Related income tax effect                 (28,097) (5,840) (22,980)
Net reclassification adjustment for losses included in net income                 0 16,296 7,659
Related income tax effect                 0 (3,852) (1,785)
Total AFS securities - all other                 89,466 30,855 81,521
Net effect of AFS securities on other comprehensive income                 89,466 30,855 81,521
Cash flow hedge derivatives:                      
Unrealized (loss) gain on cash flow hedge before reclassification to interest expense                 (3,340) 12,744 6,548
Related income tax effect                 798 (2,987) (1,526)
Net reclassification adjustment for gains included in net income                 (9,718) (20,932) (23,574)
Related income tax effect                 2,323 4,926 5,493
Net effect of cash flow hedge derivatives on other comprehensive income                 (9,937) (6,249) (13,059)
Defined benefit pension plan:                      
Net actuarial gain during the period                 7,089 12,348 2,635
Related income tax expense                 (1,694) (2,951) (613)
Related income tax effect                 (17) (540) (780)
Amortization of net actuarial loss recognized in net income                 69 2,315 3,347
Net effect of change in defined benefit pension plan on other comprehensive income                 5,447 11,172 4,589
Net current-period other comprehensive income (loss), net of tax                 84,976 35,778 73,051
Total Comprehensive Income                 $ 549,579 $ 408,774 $ 439,364
[1] For further information, see the related discussion “Quarterly Results” included in Management’s Discussion and Analysis.