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CHANGE IN ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 2,477,636 |
Other comprehensive income (loss) | $ 138,945 | $ (128,942) | 82,680 | $ (117,542)
Less: Amounts reclassified from accumulated other comprehensive loss | 3,916 | 4,290 | 11,294 | 12,675
Net current-period other comprehensive (loss) income | 142,861 | (124,652) | 93,974 | (104,867)
Ending balance | 2,678,264 |  | 2,678,264 |
Total |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (642,878) | (656,059) | (593,991) | (675,844)
Net current-period other comprehensive (loss) income | 142,861 | (124,652) | 93,974 | (104,867)
Ending balance | (500,017) | (780,711) | (500,017) | (780,711)
Net change in investment securities available-for-sale |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (549,039) | (550,890) | (499,932) | (563,533)
Other comprehensive income (loss) | 128,223 | (127,523) | 79,116 | (114,880)
Less: Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0 | 0
Net current-period other comprehensive (loss) income | 128,223 | (127,523) | 79,116 | (114,880)
Ending balance | (420,816) | (678,413) | (420,816) | (678,413)
Net change in investment securities held-to-maturity |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (84,046) | (99,945) | (91,523) | (108,503)
Other comprehensive income (loss) | 0 | 0 | 0 | 0
Less: Amounts reclassified from accumulated other comprehensive loss | 3,965 | 4,366 | 11,442 | 12,924
Net current-period other comprehensive (loss) income | 3,965 | 4,366 | 11,442 | 12,924
Ending balance | (80,081) | (95,579) | (80,081) | (95,579)
Net change in defined benefit plan |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (4,790) | (4,571) | (4,614) | (4,482)
Other comprehensive income (loss) | (4) | (3) | (81) | 2
Less: Amounts reclassified from accumulated other comprehensive loss | (49) | (48) | (148) | (142)
Net current-period other comprehensive (loss) income | (53) | (51) | (229) | (140)
Ending balance | (4,843) | (4,622) | (4,843) | (4,622)
Net change in fair value of derivatives used for cash flow hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (5,423) | (1,115) | 1,597 | 108
Other comprehensive income (loss) | 10,722 | (1,608) | 3,702 | (2,752)
Less: Amounts reclassified from accumulated other comprehensive loss | 0 | (28) | 0 | (107)
Net current-period other comprehensive (loss) income | 10,722 | (1,636) | 3,702 | (2,859)
Ending balance | 5,299 | (2,751) | 5,299 | (2,751)
Net change in equity method investments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 420 | 462 | 481 | 566
Other comprehensive income (loss) | 4 | 192 | (57) | 88
Less: Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0 | 0
Net current-period other comprehensive (loss) income | 4 | 192 | (57) | 88
Ending balance | $ 424 | $ 654 | $ 424 | $ 654

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