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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Net losses on sales of investment securities | $ (279) | $ 0 | $ 0 | $ 0 | $ 230 | $ 0 | $ (1,640) | $ 0 | $ (279) | $ (1,410) | $ 0
Income tax expense |  |  |  |  |  |  |  |  | (18,758) | (34,596) | (26,273)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (646) | (1,787) | (3,306)
Total reclassifications, net of tax | $ 15,792 | $ 15,193 | $ 14,224 | $ 14,277 | $ 4,288 | $ 11,812 | $ 12,025 | $ 13,079 | 59,486 | 41,204 | 46,992
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | 0 | (138) | (3,847)
Total reclassifications, net of tax |  |  |  |  |  |  |  |  | (646) | (1,787) | (3,306)
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 |  |  |  |  |  |  |  |  | (1,153) | (1,293) | (1,599)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (329) | (460) | (634)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (824) | (833) | (965)
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 |  |  |  |  |  |  |  |  | (1,153) | (1,293) | (1,599)
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) | (17)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (5) | (7) | (6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (13) | (11) | (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) | (17)
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) | (7) | (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (13) | (11) | (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 |  |  |  |  |  |  |  |  | 204 | (849) | 0
Investment Securities | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Net losses on sales of investment securities |  |  |  |  |  |  |  |  | 279 | (1,410) | 0
Income tax expense |  |  |  |  |  |  |  |  | (75) | 561 | 0
Net of tax |  |  |  |  |  |  |  |  | 204 | (849) | 0
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 |  |  |  |  |  |  |  |  | (850) | (938) | (3,306)
Defined Benefit Plans | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (1,189) | (1,467) | (5,481)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (339) | (529) | (2,175)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | $ (850) | $ (938) | $ (3,306)

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