CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,836,683	$ 1,638,394
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity	1,169	1,206
Income tax effect	(307)	(306)
Other comprehensive income (loss), net of income tax effect	28,919	4,264
Ending balance	1,864,560	1,691,617
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(96,560)	(136,569)
Other comprehensive income (loss), net of income tax effect	28,919	4,264
Ending balance	(67,641)	(132,305)
Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrealized gains (losses) arising during period, before tax	(13,249)	4,480
Income tax effect	3,484	(1,138)
Other comprehensive income (loss) before reclassifications	(9,765)	3,342
Reclassification adjustments for (gains) losses included in net income, before tax	51,319	30
Income tax effect	(13,497)	(8)
Amounts reclassified from accumulated other comprehensive income (loss) to net income	37,822	22
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity	1,169	1,206
Income tax effect	(307)	(306)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity	862	900
Other comprehensive income (loss), net of income tax effect	$ 28,919	$ 4,264

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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