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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning balance | $ 2,145,565 | $ 1,977,641 | $ 2,034,770 | $ 1,912,571
Other comprehensive loss before reclassifications |  |  | (71,775) | (368,696)
Amounts reclassified from accumulated other comprehensive income |  |  | 3,656 | (506)
Period change | (89,306) | (115,533) | (68,119) | (369,202)
Ending balance | 2,092,644 | 1,906,666 | 2,092,644 | 1,906,666
Total |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning balance | (217,964) | (198,556) | (239,151) | 55,113
Period change | (89,306) | (115,533) | (68,119) | (369,202)
Ending balance | (307,270) | (314,089) | (307,270) | (314,089)
Unrealized Gains (Losses) on Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning balance |  |  | (234,495) | 59,774
Other comprehensive loss before reclassifications |  |  | (71,633) | (369,096)
Amounts reclassified from accumulated other comprehensive income |  |  | 3,644 | (898)
Period change |  |  | (67,989) | (369,994)
Ending balance | (302,484) | (310,220) | (302,484) | (310,220)
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning balance |  |  | 130 | (660)
Other comprehensive loss before reclassifications |  |  | (142) | 400
Amounts reclassified from accumulated other comprehensive income |  |  | 12 | 392
Period change |  |  | (130) | 792
Ending balance | 0 | 132 | 0 | 132
Unrealized Gains (Losses) on Defined Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Beginning balance |  |  | (4,786) | (4,001)
Other comprehensive loss before reclassifications |  |  | 0 | 0
Amounts reclassified from accumulated other comprehensive income |  |  | 0 | 0
Period change |  |  | 0 | 0
Ending balance | $ (4,786) | $ (4,001) | $ (4,786) | $ (4,001)

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