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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Before Tax
Other comprehensive income (loss), before tax	$ 6,310			$ (7,999)			$ 38,499	$ (32,917)
Tax Effect
Other comprehensive income, tax	1,641			(2,144)			10,179	(8,828)
Net of Tax
Total other comprehensive income (loss), net of tax	4,669	$ 12,413	$ 11,238	(5,855)	$ (3,519)	$ (14,715)	28,320	(24,089)
Net unrealized gains on investment securities
Before Tax
Other comprehensive income (loss) before reclassification, before tax	6,027			(8,297)			37,671	(33,809)
Reclassification from AOCI, before tax	(36)			0			(36)	0
Other comprehensive income (loss), before tax	5,991			(8,297)			37,635	(33,809)
Tax Effect
Other comprehensive income (loss) before reclassifications, tax	1,615			(2,225)			10,098	(9,097)
Reclassification from AOCI, tax	(10)			0			(10)	0
Other comprehensive income, tax	1,605			(2,225)			10,088	(9,097)
Net of Tax
Other comprehensive income (loss), before reclassifications, net of tax	4,412			(6,072)			27,573	(24,712)
Reclassification from AOCI, net of tax	(26)			0			(26)	0
Total other comprehensive income (loss), net of tax	4,386			(6,072)			27,547	(24,712)
Amortization of net actuarial loss
Before Tax
Reclassification from AOCI, before tax	310			289			837	865
Tax Effect
Reclassification from AOCI, tax	31			78			84	262
Net of Tax
Reclassification from AOCI, net of tax	279			211			753	603
Amortization of net transition obligation
Before Tax
Reclassification from AOCI, before tax	5			5			14	14
Tax Effect
Reclassification from AOCI, tax	3			2			4	4
Net of Tax
Reclassification from AOCI, net of tax	2			3			10	10
Amortization of prior service cost
Before Tax
Reclassification from AOCI, before tax	4			4			13	13
Tax Effect
Reclassification from AOCI, tax	2			1			3	3
Net of Tax
Reclassification from AOCI, net of tax	2			3			10	10
Defined benefit plans, net
Before Tax
Other comprehensive income (loss), before tax	(319)			(298)			(864)	(892)
Tax Effect
Other comprehensive income, tax	(36)			(81)			(91)	(269)
Net of Tax
Other comprehensive income (loss), before reclassifications, net of tax	0			0			0	0
Reclassification from AOCI, net of tax	283			217			773	623
Total other comprehensive income (loss), net of tax	$ 283			$ 217			$ 773	$ 623

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