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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)