v3.26.3
Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]                
Net Income $ 128,704 $ 131,377 $ 124,200 $ 130,748 $ 120,721 $ 84,306 $ 384,281 $ 335,775
Available for sale ("AFS") securities:                
Change in net unrealized (loss) gain on AFS securities arising during the period (109,778)     36,056     (126,070) 98,773
Related income tax effect 26,237     (8,618)     30,131 (23,607)
Net reclassification adjustment for losses included in net income 0     0     9,728 0
Related income tax effect 0     0     (2,325) 0
Net effect of AFS securities on other comprehensive income (83,541)     27,438     (88,536) 75,166
Cash flow hedge derivatives:                
Unrealized gain (loss) on cash flow hedge before reclassification to interest expense 7,104     414     11,869 (4,594)
Related income tax effect (1,698)     (99)     (2,837) 1,098
Net reclassification adjustment for gains included in net income (2,018)     (2,470)     (6,053) (7,387)
Related income tax effect 483     590     1,447 1,765
Net effect of cash flow hedge derivatives on other comprehensive income 3,871     (1,565)     4,426 (9,118)
Total change in other comprehensive income, net of tax (79,670) 5,748 (10,188) 25,913 11,280 28,895 (84,110) 66,088
Defined benefit pension plan:                
Amortization of net actuarial loss recognized in net income 0     52     0 52
Related income tax effect 0     (12)     0 (12)
Net effect of change in defined benefit pension plan asset on other comprehensive income 0     40     0 40
Total Comprehensive Income $ 49,034 $ 137,125 $ 114,012 $ 156,661 $ 132,001 $ 113,201 $ 300,171 $ 401,863