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ACCUMULATED OTHER COMPREHENSIVE INCOME OR LOSS, Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net gains on securities transactions $ 252 $ 522 $ 302 $ 522
Pension and other employee benefits 1,557 1,479 3,286 2,838
Tax effect 1,314 869 2,440 1,820
Net of tax 2,577 1,930 4,853 3,994
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net of tax 67 (233) 260 (145)
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]        
Net gains on securities transactions (252) (522) (302) (522)
Tax effect 96 201 115 201
Net of tax (156) (321) (187) (321)
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]        
Tax effect (140) (55) (277) (110)
Net of tax 223 88 447 176
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 [1] (21) (22) (43) (44)
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 [1] $ 384 $ 165 $ 767 $ 330
[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).