GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 150,391	[1]	$ 130,074	[1]	$ 129,617	$ 129,348
Other Intangible Assets	11,753		10,648
Total goodwill and other intangible assets	162,144		140,722
Core deposit intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	10,328		9,660
Other identifiable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	$ 1,425		$ 988

[1] Approximately $38.3 million and $39.5 million is expected to be deductible for tax purposes at December 31, 2012 and 2011, respectively.