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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified Out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Net gains (losses) on sales of investment securities | $ 0 | $ 36 | $ 0 | $ 0 | $ (279) | $ 0 | $ 0 | $ 0 | $ 36 | $ (279) | $ (1,410)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (19,605) | (18,758) | (34,596)
Net of tax |  |  |  |  |  |  |  |  | 37,660 | (19,342) | 572
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (818) |  | (1,787)
Total reclassifications, net of tax | $ 14,197 | $ 14,554 | $ 13,534 | $ 16,037 | $ 15,792 | $ 15,193 | $ 14,224 | $ 14,277 | 58,322 | 59,486 | 41,204
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | 0 | 0 | (138)
Total reclassifications, net of tax |  |  |  |  |  |  |  |  | (818) | (646) | (1,787)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (1,117) | (1,153) | (1,293)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (299) | (329) | (460)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (818) | (824) | (833)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (1,117) | (1,153) | (1,293)
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (18) | (18) | (18)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (5) | (5) | (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (13) | (13) | (11)
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member] | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (18) | (18) | (18)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (18) | (18) | (18)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (5) | (5) | (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (13) | (13) | (11)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (18) | (18) | (18)
Investment Securities |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | 26 | 204 | (849)
Investment Securities | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Net gains (losses) on sales of investment securities |  |  |  |  |  |  |  |  | 36 | 279 | (1,410)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (10) | (75) | 561
Net of tax |  |  |  |  |  |  |  |  | 26 | 204 | (849)
Defined Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (844) | (850) | (938)
Defined Benefit Plans | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (1,153) | (1,189) | (1,467)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (309) | (339) | (529)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | $ (844) | $ (850) | $ (938)

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