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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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