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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated Other Comprehensive (loss) income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated other comprehensive (loss) income, net of tax: |  |  |  |  |  |  |  |
Balance | $ 1,202,503 | $ 1,191,253 | $ 1,169,583 | $ 1,140,522 | $ 1,155,287 | $ 1,192,620 | $ 1,169,583 | $ 1,192,620
Total other comprehensive loss, net of tax | (2,528) | (5,747) | (4,259) | (23,086) | (20,570) | (43,199) | (12,534) | (86,855)
Balance | 1,204,344 | 1,202,503 | 1,191,253 | 1,140,791 | 1,140,522 | 1,155,287 | 1,204,344 | 1,140,791
Accumulated Other Comprehensive Loss, Net of Deferred Taxes |  |  |  |  |  |  |  |
Accumulated other comprehensive (loss) income, net of tax: |  |  |  |  |  |  |  |
Balance | (104,385) | (98,638) | (94,379) | (69,950) | (49,380) | (6,181) | (94,379) | (6,181)
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (14,615) | (84,542)
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  | 2,081 | (2,313)
Total other comprehensive loss, net of tax | (2,528) | (5,747) | (4,259) | (23,086) | (20,570) | (43,199) | (12,534) | (86,855)
Balance | (106,913) | $ (104,385) | (98,638) | (93,036) | $ (69,950) | (49,380) | (106,913) | (93,036)
Securities |  |  |  |  |  |  |  |
Accumulated other comprehensive (loss) income, net of tax: |  |  |  |  |  |  |  |
Balance |  |  | (100,870) |  |  | (7,864) | (100,870) | (7,864)
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (15,338) | (96,565)
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  | 2,666 |
Total other comprehensive loss, net of tax |  |  |  |  |  |  | (12,672) | (96,565)
Balance | (113,542) |  |  | (104,429) |  |  | (113,542) | (104,429)
Defined Benefit Plans |  |  |  |  |  |  |  |
Accumulated other comprehensive (loss) income, net of tax: |  |  |  |  |  |  |  |
Balance |  |  | (5,266) |  |  | (1,306) | (5,266) | (1,306)
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | 952 | 2,051
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  | (781) | (1,923)
Total other comprehensive loss, net of tax |  |  |  |  |  |  | 171 | 128
Balance | (5,095) |  |  | (1,178) |  |  | (5,095) | (1,178)
Derivatives |  |  |  |  |  |  |  |
Accumulated other comprehensive (loss) income, net of tax: |  |  |  |  |  |  |  |
Balance |  |  | $ 11,757 |  |  | $ 2,989 | 11,757 | 2,989
Other comprehensive (loss) income before reclassifications |  |  |  |  |  |  | (229) | 9,972
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  | 196 | (390)
Total other comprehensive loss, net of tax |  |  |  |  |  |  | (33) | 9,582
Balance | $ 11,724 |  |  | $ 12,571 |  |  | $ 11,724 | $ 12,571

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