ACCUMULATED OTHER COMPREHENSIVE INCOME OR LOSS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	$ 787		$ (2,623)		$ 155		$ (2,807)
Other comprehensive income before Reclassification	696		(2)		1,240		(2,035)
Amounts reclassified from accumulated other comprehensive income	(233)		240		(145)		467
Net current period other comprehensive income	463		(1,752)		1,095		(1,568)
Balance at end of period	1,250		(4,375)		1,250		(4,375)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net gain on securities transactions	522		1		522		1
Pension and other employee benefits	1,479		1,365		2,838		2,789
Income tax expense	869		1,306		1,820		2,478
Net of tax	1,930		2,655		3,994		5,066
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of tax	233		(239)		145		(466)
Unrealized Gains and Losses on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	6,587		7,980		6,043		8,023
Other comprehensive income before Reclassification	696		(1,992)		1,240		(2,035)
Amounts reclassified from accumulated other comprehensive income	(321)		0		(321)		0
Net current period other comprehensive income	375		(1,992)		919		(2,035)
Balance at end of period	6,962		5,988		6,962		5,988
Unrealized Gains and Losses on Securities Available for Sale [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total impairment losses	0		0		0		0
Net gain on securities transactions	522		1		522		1
Income tax expense	201		0		201		0
Net of tax	321		1		321		1
Defined Benefit and Other Benefit Plans [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	(5,800)		(10,603)		(5,888)		(10,830)
Other comprehensive income before Reclassification	0		0		0		0
Amounts reclassified from accumulated other comprehensive income	88		240		176		467
Net current period other comprehensive income	88		240		176		467
Balance at end of period	(5,712)		(10,363)		(5,712)		(10,363)
Defined Benefit and Other Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	55		140		110		293
Net of tax	(88)		(240)		(176)		(467)
Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Pension and other employee benefits	22	[1]	21	[1]	44	[1]	41	[1]
Actuarial Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Pension and other employee benefits	$ (165)	[1]	$ (401)	[1]	$ (330)	[1]	$ (801)	[1]

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and other benefit plan costs (see Note 9 for additional information).