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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
AFS Securities:        
Unrealized holding gains, pre-tax amount $ (746) $ 4,551 $ 32,451 $ 32,270
Unrealized holdings gains, tax (expense) benefit 160 (978) (6,977) (6,938)
Unrealized holdings gains, after-tax amount (586) 3,573 25,474 25,332
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 1 0 28
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 0 0 (6)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 0 1 0 22
Net unrealized gains, pre-tax amount (746) 4,550 32,451 32,242
Net unrealized gains, tax (expense) benefit 160 (978) (6,977) (6,932)
Net unrealized gains, after-tax amount (586) 3,572 25,474 25,310
Cash Flow Hedges:        
Net decrease in fair value, pre-tax amount 688 (394) (418) (3,105)
Net decrease in fair value, tax (expense) benefit (148) 84 90 667
Net decrease in fair value, after-tax amount 540 (310) (328) (2,438)
Less: effective portion reclassified into interest expense, after-tax amount     (298) (520)
Net decrease in fair value, pre-tax amount 856 (52) (38) (2,443)
Net decrease in fair value, tax (expense) benefit (184) 11 8 525
Net decrease in fair value, after-tax amount 672 (41) (30) (1,918)
Postretirement Plans:        
Net actuarial gain, pre-tax amount 175 68 526 202
Net actuarial gain, tax (expense) benefit (37) (14) (113) (43)
Net actuarial gain, after-tax amount 138 54 413 159
Less: Amortiaztion of net prior service credits, pre-tax amount 6 6 18 18
Less: Amortiaztion of net prior service credits, tax (expense) benefit (1) (1) (4) (4)
Less: Amortiaztion of net prior service credits, after-tax amount 5 5 14 14
Net gain on postretirement plans, pre-tax amount 169 62 508 184
Net gain on postretirement plans, tax (expense) benefit (36) (13) (109) (39)
Net gain on postretirement plans, net of tax 133 49 399 145
Other comprehensive income, pre-tax amount 279 4,560 32,921 29,983
Other comprehensive income, tax (expense) benefit (60) (980) (7,078) (6,446)
Other comprehensive income 219 3,580 25,843 23,537
Interest Expense, Borrowings        
Cash Flow Hedges:        
Less: effective portion reclassified into interest expense, pre-tax amount (479) (342) (990) (662)
Less: effective portion reclassified into interest expense, tax (expense) benefit 103 73 213 142
Less: effective portion reclassified into interest expense, after-tax amount (376) (269) (777) (520)
Interest Income, Interest and Fees on Loans        
Cash Flow Hedges:        
Less: effective portion reclassified into interest expense, pre-tax amount 311 0 610 0
Less: effective portion reclassified into interest expense, tax (expense) benefit (67) 0 (131) 0
Less: effective portion reclassified into interest expense, after-tax amount $ 244 $ 0 $ 479 $ 0