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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,864,560 | $ 1,691,617 | $ 1,836,683 | $ 1,638,394
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,206 | 1,406 | 2,375 | 2,612
Income tax effect | (320) | (361) | (627) | (667)
Other comprehensive income (loss), net of income tax effect | (3,684) | 947 | 25,235 | 5,211
Ending balance | 1,863,558 | 1,746,865 | 1,863,558 | 1,746,865
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (67,641) | (132,305) | (96,560) | (136,569)
Other comprehensive income (loss), net of income tax effect | (3,684) | 947 | 25,235 | 5,211
Ending balance | (71,325) | (131,358) | (71,325) | (131,358)
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 | (8,011) | (851) | (21,260) | 3,629
Income tax effect | 2,119 | 219 | 5,603 | (919)
Other comprehensive income (loss) before reclassifications | (5,892) | (632) | (15,657) | 2,710
Reclassification adjustments for (gains) losses included in net income, before tax | 1,797 | 719 | 53,116 | 749
Income tax effect | (475) | (185) | (13,972) | (193)
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 1,322 | 534 | 39,144 | 556
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,206 | 1,406 | 2,375 | 2,612
Income tax effect | (320) | (361) | (627) | (667)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity | 886 | 1,045 | 1,748 | 1,945
Other comprehensive income (loss), net of income tax effect | $ (3,684) | $ 947 | $ 25,235 | $ 5,211

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