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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)