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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ 467,376 | $ 446,381 | $ 451,278 | $ 541,294
Other comprehensive (loss) income before reclassifications | (11,119) | (19,665) | (4,368) | (127,811)
Less: Amounts reclassified from AOCI | (2,845) | 1,825 | (115) | 2,416
Other comprehensive loss | (8,274) | (21,490) | (4,253) | (130,227)
Ending Balance | 463,298 | 431,007 | 463,298 | 431,007
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (121,934) | (114,966) | (125,955) | (6,229)
Ending Balance | (130,208) | (136,456) | (130,208) | (136,456)
Net Unrealized Gains (Losses) on Debt Securities(1) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (127,829) | (116,037) | (131,539) | (1,173)
Other comprehensive (loss) income before reclassifications | (14,220) | (22,319) | (7,844) | (136,135)
Less: Amounts reclassified from AOCI | (2,821) | 1,912 | (155) | 2,960
Other comprehensive loss | (11,399) | (24,231) | (7,689) | (139,095)
Ending Balance | (139,228) | (140,268) | (139,228) | (140,268)
Net Unrealized (Losses) Gains on Cash Flow Hedges(1) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 6,213 | 3,985 | 5,891 | (1,779)
Other comprehensive (loss) income before reclassifications | 3,101 | 2,654 | 3,476 | 8,324
Less: Amounts reclassified from AOCI | (29) | 94 | 24 | 0
Other comprehensive loss | 3,130 | 2,560 | 3,452 | 8,324
Ending Balance | 9,343 | 6,545 | 9,343 | 6,545
Defined Benefit Postretirement Plans(1) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (318) | (2,914) | (307) | (3,277)
Other comprehensive (loss) income before reclassifications | 0 | 0 | 0 | 0
Less: Amounts reclassified from AOCI | 5 | (181) | 16 | (544)
Other comprehensive loss | (5) | 181 | (16) | 544
Ending Balance | $ (323) | $ (2,733) | $ (323) | $ (2,733)

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