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OTHER COMPREHENSIVE INCOME (LOSS) Components of 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
AFS Debt Securities:        
Unrealized holding gains, pre-tax amount $ (18,115) $ (28,432) $ (9,993) $ (173,421)
Unrealized holdings gains, tax (expense) benefit 3,895 6,113 2,149 37,286
Unrealized holdings gains, after-tax amount (14,220) (22,319) (7,844) (136,135)
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, pre-tax amount 1,742 2,436 5,137 3,780
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, tax (expense) benefit (375) (524) (1,104) (813)
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, after-tax amount 1,367 1,912 4,033 2,967
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax (5,335) 0 (5,335) (9)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 1,147 0 1,147 2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (4,188) 0 (4,188) (7)
Net unrealized gains, pre-tax amount (14,522) (30,868) (9,795) (177,192)
Net unrealized gains, tax (expense) benefit 3,123 6,637 2,106 38,097
Net unrealized gains, after-tax amount (11,399) (24,231) (7,689) (139,095)
Cash Flow Hedges:        
Net decrease in fair value, pre-tax amount 3,950 3,381 4,427 10,604
Net decrease in fair value, tax (expense) benefit (849) (727) (951) (2,280)
Net decrease in fair value, after-tax amount 3,101 2,654 3,476 8,324
Net decrease in fair value, pre-tax amount 3,987 3,261 4,397 10,604
Net decrease in fair value, tax (expense) benefit (857) (701) (945) (2,280)
Net decrease in fair value, after-tax amount 3,130 2,560 3,452 8,324
Postretirement Plans:        
Net gain on postretirement plans, pre-tax amount (6) 230 (20) 693
Net gain on postretirement plans, tax (expense) benefit 1 (49) 4 (149)
Net gain on postretirement plans, net of tax (5) 181 (16) 544
Other comprehensive income, pre-tax amount (10,541) (27,377) (5,418) (165,895)
Other comprehensive income, tax (expense) benefit 2,267 5,887 1,165 35,668
Other comprehensive loss (8,274) (21,490) (4,253) (130,227)
Interest Expense, Borrowings        
Cash Flow Hedges:        
Less: effective portion reclassified into interest expense, pre-tax amount 872 241 2,518 (498)
Less: effective portion reclassified into interest expense, tax (expense) benefit (187) (52) (541) 107
Less: effective portion reclassified into interest expense, after-tax amount 685 189 1,977 (391)
Interest Income, Interest and Fees on Loans        
Cash Flow Hedges:        
Less: effective portion reclassified into interest expense, pre-tax amount (909) (121) (2,488) 498
Less: effective portion reclassified into interest expense, tax (expense) benefit 195 26 535 (107)
Less: effective portion reclassified into interest expense, after-tax amount $ (714) $ (95) $ (1,953) $ 391