v3.26.1
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 2,115,517 $ 1,836,683
Unrealized gains (losses) arising during period, before tax (1,824) (13,249)
Income tax effect 484 3,484
Other comprehensive income (loss) before reclassifications (1,340) (9,765)
Reclassification adjustments for (gains) losses included in net income, before tax 112 51,319
Income tax effect (30) (13,497)
Amounts reclassified from accumulated other comprehensive income (loss) to net income 82 37,822
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 887 1,169
Income tax effect (236) (307)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 651 862
Other comprehensive income (loss), net of income tax effect (607) 28,919
Ending balance 2,144,300 1,864,560
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (54,050) (96,560)
Other comprehensive income (loss), net of income tax effect (607) 28,919
Ending balance (54,657) (67,641)
Unrealized Gains (Losses) on Available for Sale Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (57,012) (96,560)
Unrealized gains (losses) arising during period, before tax 5,120 (13,249)
Income tax effect (1,356) 3,484
Other comprehensive income (loss) before reclassifications 3,764 (9,765)
Reclassification adjustments for (gains) losses included in net income, before tax (355) 51,319
Income tax effect 94 (13,497)
Amounts reclassified from accumulated other comprehensive income (loss) to net income (261) 37,822
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 887 1,169
Income tax effect (236) (307)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 651 862
Other comprehensive income (loss), net of income tax effect 4,154 28,919
Ending balance (52,858) (67,641)
Unrealized Gains (Losses) on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 2,962 0
Unrealized gains (losses) arising during period, before tax (6,944) 0
Income tax effect 1,840 0
Other comprehensive income (loss) before reclassifications (5,104) 0
Reclassification adjustments for (gains) losses included in net income, before tax 467 0
Income tax effect (124) 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income 343 0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 0 0
Income tax effect 0 0
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 0 0
Other comprehensive income (loss), net of income tax effect (4,761) 0
Ending balance $ (1,799) $ 0