OTHER COMPREHENSIVE INCOME (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
Other Comprehensive Income (Loss) [Abstract]
Change in unrealized loss on securities transferred to held to maturity, after tax	$ 10	$ 28	$ 22	$ 62
Tax expense (benefit)	7,531	8,059	14,708	15,235
Net income	10,460	12,039	20,494	22,609
Change in net unrealized gain during the period, tax	57	(145)	27	51
Change in net unrealized gain during the period, after tax	70	(175)	33	66
Total defined benefit plans, tax	117	0	234	0
Change in pension and other postretirement obligations, net of deferred tax expense of $117 during the three months ended June 30, 2014 and $234 during the six months ended June 30, 2014	144	0	288	0
Total other comprehensive income, before tax	414	(261)	636	135
Total other comprehensive income, tax	186	(118)	285	59
Net other comprehensive income during during the period	228	(143)	351	76
Securities Held-To-Maturity and Transferred Securities [Member]
Other Comprehensive Income (Loss) [Abstract]
Change in non-credit component of OTTI, pre-tax	8	8	16	16
Change in non-credit component of OTTI, tax	4	4	8	8
Change in non-credit component of OTTI, after tax	4	4	8	8
Change in unrealized loss on securities transferred to held to maturity, pre-tax	18	51	38	112
Change in unrealized loss on securities transferred to held to maturity, tax	8	23	16	50
Change in unrealized loss on securities transferred to held to maturity, after tax	10	28	22	62
Total Securities held to maturity and transferred securities before tax	26	59	54	128
Total securities held to maturity and transferred tax	12	27	24	58
Total securities held to maturity and transferred securities, after tax	14	32	30	70
Securities Available-For-Sale [Member]
Other Comprehensive Income (Loss) [Abstract]
Change in net unrealized gain during the period, pre-tax	127	(320)	60	117
Change in net unrealized gain during the period, tax	57	(145)	27	51
Change in net unrealized gain during the period, after tax	70	(175)	33	66
Total securities available-for-sale, pre-tax	127	(320)	60	7
Total securities available-for-sale, tax	57	(145)	27	1
Total securities available-for-sale, after tax	70	(175)	33	6
Securities Available-For-Sale [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) [Abstract]
Reclassification adjustment for net gains included in net gain on securities	0	0	0	(110)
Tax expense (benefit)	0	0	0	(50)
Net income	0	0	0	(60)
Defined Benefit Plans [Member]
Other Comprehensive Income (Loss) [Abstract]
Total defined benefit plans, pre-tax	261	0	522	0
Total defined benefit plans, tax	117	0	234	0
Change in pension and other postretirement obligations, net of deferred tax expense of $117 during the three months ended June 30, 2014 and $234 during the six months ended June 30, 2014	144	0	288	0
Defined Benefit Plans [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) [Abstract]
Reclassification adjustment for expense included in salaries and employee benefits expense	261	0	522	0
Tax expense (benefit)	117	0	234	0
Net income	$ 144	$ 0	$ 288	$ 0