GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Changes in the carrying amount of goodwill
Balance, at the beginning of the period	$ 56,144,000	$ 39,141,000		$ 39,141,000
Balance, at the end of the period	62,008,000	56,144,000		62,008,000
Gross amount of CDI and CRI:
Balance, beginning of period	60,972,000	67,100,000	76,319,000	67,100,000	76,319,000
Addition	1,300,000	1,700,000		3,000,000
Fully amortized portion		(7,828,000)	(2,690,000)	(7,828,000)	(2,690,000)
Balance, end of period	62,272,000	60,972,000	73,629,000	62,272,000	73,629,000
Accumulated Amortization:
Balance, end of period	(43,592,000)	(49,685,000)	(52,783,000)	(49,685,000)	(50,476,000)
Amortization	(1,737,000)	(1,735,000)	(2,308,000)	(3,472,000)	(4,615,000)
Fully amortized portion		7,828,000	2,690,000	7,828,000	2,690,000
Balance, beginning of period	(45,329,000)	(43,592,000)	(52,401,000)	(45,329,000)	(52,401,000)
Finite lived intangible assets, net
Net CDI and CRI, end of period	16,943,000	17,380,000	21,228,000	16,943,000	21,228,000
Estimated aggregate amortization expense related to the intangible assets
2012	6,500,000			6,500,000
2013	5,100,000			5,100,000
2014	3,500,000			3,500,000
2015	3,200,000			3,200,000
2016	1,600,000			1,600,000
EQF
Changes in the carrying amount of goodwill
Tax deductible addition from acquisition		17,003,000
Celtic
Changes in the carrying amount of goodwill
Tax deductible addition from acquisition	$ 5,864,000