v3.26.1
CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ 2,144,300 $ 1,864,560 $ 2,115,517 $ 1,836,683
Unrealized gains (losses) arising during period, before tax (6,203) (8,011) (8,027) (21,260)
Income tax effect 1,644 2,119 2,128 5,603
Other comprehensive income (loss) before reclassifications (4,559) (5,892) (5,899) (15,657)
Reclassification adjustments for (gains) losses included in net income, before tax 232 1,797 344 53,116
Income tax effect (61) (475) (91) (13,972)
Amounts reclassified from accumulated other comprehensive income (loss) to net income 171 1,322 253 39,144
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 952 1,206 1,839 2,375
Income tax effect (253) (320) (489) (627)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 699 886 1,350 1,748
Other comprehensive income (loss), net of income tax effect (3,689) (3,684) (4,296) 25,235
Ending balance 2,205,692 1,863,558 2,205,692 1,863,558
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (54,657) (67,641) (54,050) (96,560)
Other comprehensive income (loss), net of income tax effect (3,689) (3,684) (4,296) 25,235
Ending balance (58,346) (71,325) (58,346) (71,325)
Unrealized Gains (Losses) on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (52,858) (67,641) (57,012) (96,560)
Unrealized gains (losses) arising during period, before tax 1,360 (8,011) 6,480 (21,260)
Income tax effect (360) 2,119 (1,716) 5,603
Other comprehensive income (loss) before reclassifications 1,000 (5,892) 4,764 (15,657)
Reclassification adjustments for (gains) losses included in net income, before tax (154) 1,797 (509) 53,116
Income tax effect 41 (475) 135 (13,972)
Amounts reclassified from accumulated other comprehensive income (loss) to net income (113) 1,322 (374) 39,144
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 952 1,206 1,839 2,375
Income tax effect (253) (320) (489) (627)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 699 886 1,350 1,748
Other comprehensive income (loss), net of income tax effect 1,586 (3,684) 5,740 25,235
Ending balance (51,272) (71,325) (51,272) (71,325)
Unrealized Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (1,799) 0 2,962 0
Unrealized gains (losses) arising during period, before tax (7,563) 0 (14,507) 0
Income tax effect 2,004 0 3,844 0
Other comprehensive income (loss) before reclassifications (5,559) 0 (10,663) 0
Reclassification adjustments for (gains) losses included in net income, before tax 386 0 853 0
Income tax effect (102) 0 (226) 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income 284 0 627 0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity 0 0 0 0
Income tax effect 0 0 0 0
Amortization of unrealized loss on securities transferred from available for sale to held to maturity 0 0 0 0
Other comprehensive income (loss), net of income tax effect (5,275) 0 (10,036) 0
Ending balance $ (7,074) $ 0 $ (7,074) $ 0