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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Investment securities gains (losses) |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ (1,410) | $ 0 | $ (1,866)
Tax benefit |  |  |  |  |  |  |  |  | (33,852) | (25,228) | (27,088)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (1,787) | (3,306) | (2,160)
Total reclassifications for the period | $ 4,288 | $ 11,812 | $ 12,025 | $ 13,079 | $ 12,208 | $ 11,466 | $ 12,137 | $ 11,181 | 41,204 | 46,992 | 45,868
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (138) | (3,847) | 0
Total reclassifications for the period |  |  |  |  |  |  |  |  | (1,787) | (3,306) | (2,160)
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 |  |  |  |  |  |  |  |  | (1,293) | (1,599) | (1,688)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (460) | (634) | (672)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (833) | (965) | (1,016)
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 |  |  |  |  |  |  |  |  | (1,293) | (1,599) | (1,688)
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) | (17) | (16)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (7) | (6) | (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (11) | (11) | (9)
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) | (17) | (16)
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 |  |  |  |  |  |  |  |  | (7) | (7) | (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | (11) | (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 |  |  |  |  |  |  |  |  | (849) | 0 | (1,124)
Investment Securities | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Investment securities gains (losses) |  |  |  |  |  |  |  |  | (1,410) | 0 | (1,866)
Tax benefit |  |  |  |  |  |  |  |  | 561 | 0 | 742
Net of tax |  |  |  |  |  |  |  |  | (849) | 0 | (1,124)
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 |  |  |  |  |  |  |  |  | (938) | (3,306) | (1,036)
Defined Benefit Plans | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  | (1,467) | (5,481) | (1,722)
Reclassification from AOCI, Current Period, Tax |  |  |  |  |  |  |  |  | (529) | (2,175) | (686)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | $ (938) | $ (3,306) | $ (1,036)

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