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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)