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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Amounts reclassified out of each component of accumulated other comprehensive income
Income tax benefit (expense)	$ (2,967)		$ (4,427)		$ (5,788)	$ (9,545)
Net income	9,917	$ 8,326	13,534	$ 16,037	18,243	29,571
Amount Reclassified from AOCI
Amounts reclassified out of each component of accumulated other comprehensive income
Net income	(204)		(248)		(407)	(490)
Investment Securities
Amounts reclassified out of each component of accumulated other comprehensive income
Reclassification from AOCI, net of tax	0		0		0	0
Defined Benefit Plans
Amounts reclassified out of each component of accumulated other comprehensive income
Reclassification from AOCI, net of tax	(204)		(248)		(407)	(490)
Defined Benefit Plans | Amount Reclassified from AOCI
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of defined benefit plan items, before tax	(276)		(272)		(553)	(545)
Amortization of defined benefit plan items, tax	72		24		146	55
Reclassification from AOCI, net of tax	(204)		(248)		(407)	(490)
Amortization of net actuarial loss
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of defined benefit plan items, before tax	(269)		(264)		(537)	(527)
Amortization of defined benefit plan items, tax	70		22		142	51
Reclassification from AOCI, net of tax	(199)		(242)		(395)	(476)
Amortization of net actuarial loss | Amount Reclassified from AOCI
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of defined benefit plan items, before tax	(269)		(264)		(537)	(527)
Amortization of net transition obligation
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of defined benefit plan items, before tax	(4)		(4)		(9)	(9)
Amortization of defined benefit plan items, tax	1		1		2	2
Reclassification from AOCI, net of tax	(3)		(3)		(7)	(7)
Amortization of net transition obligation | Amount Reclassified from AOCI
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of defined benefit plan items, before tax	(4)		(4)		(9)	(9)
Amortization of prior service cost
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of defined benefit plan items, before tax	(3)		(4)		(7)	(9)
Amortization of defined benefit plan items, tax	1		1		2	2
Reclassification from AOCI, net of tax	(2)		(3)		(5)	(7)
Amortization of prior service cost | Amount Reclassified from AOCI
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of defined benefit plan items, before tax	$ (3)		$ (4)		$ (7)	$ (9)

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