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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)