OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Comprehensive Income (Loss) [Abstract]
Change in unrealized loss on securities transferred to held to maturity, after tax	$ (10)	$ (13)	$ (72)	$ (91)
Net gain on securities and other assets	83	67	276	180
Tax expense (benefit)	7,215	8,280	22,450	23,356
Net income	10,631	11,795	33,240	33,573
Change in net unrealized gain during the period, tax	74	(6)	125	(184)
Change in net unrealized gain during the period, after tax	90	(7)	156	(224)
Total defined benefit plans, tax	0	0	0	256
Total defined benefit plans, after tax	0	0	0	(312)
Total other comprehensive income, before tax	190	24	326	570
Total other comprehensive income, tax	86	11	146	257
Net other comprehensive income during during the period	104	13	180	313
Securities Held-To-Maturity and Transferred Securities [Member]
Other Comprehensive Income (Loss) [Abstract]
Change in non-credit component of OTTI, pre-tax	8	13	25	288
Change in non-credit component of OTTI, tax	4	6	13	130
Change in non-credit component of OTTI, after tax	4	7	12	158
Change in unrealized loss on securities transferred to held to maturity, pre-tax	18	24	130	166
Change in unrealized loss on securities transferred to held to maturity, tax	8	11	58	75
Change in unrealized loss on securities transferred to held to maturity, after tax	10	13	72	91
Total Securities held to maturity and transferred securities, before tax	26	37	155	454
Total securities held to maturity and transferred, tax	12	17	71	205
Total securities held to maturity and transferred securities, after tax	14	20	84	249
Securities Available-For-Sale [Member]
Other Comprehensive Income (Loss) [Abstract]
Change in net unrealized gain during the period, pre-tax	164	(13)	281	(408)
Change in net unrealized gain during the period, tax	74	(6)	125	(184)
Change in net unrealized gain during the period, after tax	90	(7)	156	(224)
Total securities available-for-sale, pre-tax	164	(13)	171	(452)
Total securities available-for-sale, tax	74	(6)	75	(204)
Total securities available-for-sale, after tax	90	(7)	96	(248)
Securities Available-For-Sale [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) [Abstract]
Net gain on securities and other assets	0	0	(110)	(44)
Tax expense (benefit)	0	0	(50)	(20)
Net income	0	0	(60)	(24)
Defined Benefit Plans [Member]
Other Comprehensive Income (Loss) [Abstract]
Change in the net actuarial gain or loss, pre-tax			0	568
Change in the net actuarial gain or loss, tax			0	256
Change in the net actuarial gain or loss, after tax			0	312
Total defined benefit plans, pre-tax			0	568
Total defined benefit plans, tax			0	256
Total defined benefit plans, after tax			$ 0	$ 312