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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2013
Premiums on acquired deposits
Mar. 31, 2012
Premiums on acquired deposits
Dec. 31, 2012
Premiums on acquired deposits
GOODWILL AND OTHER INTANGIBLE ASSETS              
Goodwill $ 337,438,000 $ 337,438,000 $ 337,438,000        
Market capitalization 3,650,000,000            
Total stockholders' equity 2,343,119,000 2,382,122,000 2,283,297,000 2,311,743,000      
Premiums on Acquired Deposits              
Premiums on acquired deposits         100,200,000   100,200,000
Accumulated amortization for premiums on acquired deposits         46,300,000   43,900,000
Amortization expense of premiums on acquired deposits         2,400,000 2,900,000  
Estimated Future Amortization Expense of Premiums on Acquired Deposits              
Remainder of the year         6,955,000    
Year Ending December 31, 2014         8,454,000    
Year Ending December 31, 2015         7,543,000    
Year Ending December 31, 2016         6,634,000    
Year Ending December 31, 2017         5,722,000    
Thereafter         18,567,000    
Total         $ 53,875,000