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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,863,558 | $ 1,746,865 | $ 1,836,683 | $ 1,638,394
Unrealized gains (losses) arising during period, before tax | 25,215 | 32,810 | 3,955 | 36,439
Income tax effect | (6,671) | (8,432) | (1,068) | (9,351)
Other comprehensive income (loss) before reclassifications | 18,544 | 24,378 | 2,887 | 27,088
Reclassification adjustments for (gains) losses included in net income, before tax | 1,226 | 0 | 54,342 | 749
Income tax effect | (324) | 0 | (14,296) | (193)
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 902 | 0 | 40,046 | 556
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,074 | 1,209 | 3,449 | 3,821
Income tax effect | (284) | (311) | (911) | (978)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity | 790 | 898 | 2,538 | 2,843
Other comprehensive income (loss), net of income tax effect | 20,236 | 25,276 | 45,471 | 30,487
Ending balance | 2,126,059 | 1,801,180 | 2,126,059 | 1,801,180
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (71,325) | (131,358) | (96,560) | (136,569)
Other comprehensive income (loss), net of income tax effect | 20,236 | 25,276 | 45,471 | 30,487
Ending balance | (51,089) | (106,082) | (51,089) | (106,082)
Unrealized Gains (Losses) on Available for Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (71,325) | (131,358) | (96,560) | (136,569)
Unrealized gains (losses) arising during period, before tax | 22,929 | 32,810 | 1,669 | 36,439
Income tax effect | (6,066) | (8,432) | (463) | (9,351)
Other comprehensive income (loss) before reclassifications | 16,863 | 24,378 | 1,206 | 27,088
Reclassification adjustments for (gains) losses included in net income, before tax | (186) | 0 | 52,930 | 749
Income tax effect | 49 | 0 | (13,923) | (193)
Amounts reclassified from accumulated other comprehensive income (loss) to net income | (137) | 0 | 39,007 | 556
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity | 1,074 | 1,209 | 3,449 | 3,821
Income tax effect | (284) | (311) | (911) | (978)
Amortization of unrealized loss on securities transferred from available for sale to held to maturity | 790 | 898 | 2,538 | 2,843
Other comprehensive income (loss), net of income tax effect | 17,516 | 25,276 | 42,751 | 30,487
Ending balance | (53,809) | (106,082) | (53,809) | (106,082)
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 | 0
Unrealized gains (losses) arising during period, before tax | 2,286 | 0 | 2,286 | 0
Income tax effect | (605) | 0 | (605) | 0
Other comprehensive income (loss) before reclassifications | 1,681 | 0 | 1,681 | 0
Reclassification adjustments for (gains) losses included in net income, before tax | 1,412 | 0 | 1,412 | 0
Income tax effect | (373) | 0 | (373) | 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 1,039 | 0 | 1,039 | 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 | 2,720 | 0 | 2,720 | 0
Ending balance | $ 2,720 | $ 0 | $ 2,720 | $ 0

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