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SHAREHOLDERS’ EQUITY AND COMPENSATION PLANS - Pre-tax and After-tax Changes in the Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax [Abstract] |  |  |  |
Change in unrealized gain on available-for-sale debt securities, before tax | $ (10,479) | $ 125 | $ (21,226) | $ 28,741
Change in unrealized gain on available-for-sale debt securities, tax | (2,609) | 31 | (5,285) | 7,099
Change in unrealized gain on available-for-sale debt securities, after tax | (7,870) | 94 | (15,941) | 21,642
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract] |  |  |  |
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, before tax | 0 | (417) | 0 | (421)
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, tax | 0 | (103) | 0 | (104)
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, after tax | 0 | 314 | 0 | 317
Other Comprehensive Loss, Held-to-maturity Security, OTTI, after Tax and Adjustments [Abstract] |  |  |  |
Reclassification of (gain) loss on held-to-maturity securities, before tax | (1,072) | (936) | (3,716) | (1,580)
Reclassification of (gain) loss on held-to-maturity securities, tax | (267) | (231) | (925) | (390)
Reclassification of (gain) loss on held-to-maturity securities, after tax | (805) | (705) | (2,791) | (1,190)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract] |  |  |  |
Change in unrealized loss on cash flow hedges arising during the period, before tax | 12 | 146 | 867 | (8,296)
Change in unrealized loss on cash flow hedges arising during the period, tax | 3 | 36 | 216 | (2,049)
Change in unrealized loss on cash flow hedges arising during the period, after tax | 9 | 110 | 651 | (6,247)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] |  |  |  |
Reclassification of loss on cash flow hedges, before tax | 395 | 683 | 1,149 | 1,157
Reclassification of loss on cash flow hedges, tax | 99 | 169 | 286 | 286
Reclassification of loss on cash flow hedges, after tax | (296) | (514) | (863) | (871)
OCI, Net of Tax [Abstract] |  |  |  |
Total other comprehensive income, before tax | (11,144) | (399) | (22,926) | 19,601
Total other comprehensive income, tax | (2,774) | (98) | (5,708) | 4,842
Total other comprehensive income (loss), after-tax | $ (8,370) | $ (301) | $ (17,218) | $ 14,759

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