GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in carrying amount of goodwill
Balance at the beginning of the period	$ 61,919	$ 61,919
Acquired goodwill	2,028
Balance at the end of the period	63,947	61,919	61,919
Goodwill
Disposed of goodwill			990
Acquired intangible assets
Accumulated amortization	(22,370)	(20,535)
Purchased intangibles, net	6,993	7,163
Aggregate amortization expense	1,835	1,939	2,066
Estimated amortization expense
2013	1,869
2014	1,643
2015	1,402
2016	715
2017	347
Core deposit intangibles
Acquired intangible assets
Purchased intangibles, gross	27,169	27,000
Other customer relationship intangibles
Acquired intangible assets
Purchased intangibles, gross	$ 2,194	$ 698

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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