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OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ 446,381 | $ 545,548 | $ 541,294 | $ 529,314
Other comprehensive (loss) income before reclassifications | (19,665) | (4,773) | (127,811) | (17,482)
Less: Amounts reclassified from AOCI | 1,825 | (272) | 2,416 | (909)
Other comprehensive loss | (21,490) | (4,501) | (130,227) | (16,573)
Ending Balance | 431,007 | 545,984 | 431,007 | 545,984
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (114,966) | 8,668 | (6,229) | 20,740
Ending Balance | (136,456) | 4,167 | (136,456) | 4,167
Net Unrealized Gains (Losses) on Debt Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (116,037) | 14,097 | (1,173) | 29,310
Other comprehensive (loss) income before reclassifications | (22,319) | (5,139) | (136,135) | (20,352)
Less: Amounts reclassified from AOCI | 1,912 | 0 | 2,960 | 0
Other comprehensive loss | (24,231) | (5,139) | (139,095) | (20,352)
Ending Balance | (140,268) | 8,958 | (140,268) | 8,958
Net Unrealized Losses (Gains) on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 3,985 | (1,826) | (1,779) | (4,626)
Other comprehensive (loss) income before reclassifications | 2,654 | 366 | 8,324 | 2,870
Less: Amounts reclassified from AOCI | 94 | (101) | 0 | (397)
Other comprehensive loss | 2,560 | 467 | 8,324 | 3,267
Ending Balance | 6,545 | (1,359) | 6,545 | (1,359)
Defined Benefit Postretirement Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (2,914) | (3,603) | (3,277) | (3,944)
Other comprehensive (loss) income before reclassifications | 0 | 0 | 0 | 0
Less: Amounts reclassified from AOCI | (181) | (171) | (544) | (512)
Other comprehensive loss | 181 | 171 | 544 | 512
Ending Balance | $ (2,733) | $ (3,432) | $ (2,733) | $ (3,432)

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