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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2012
Premiums on acquired deposits
Jun. 30, 2011
Premiums on acquired deposits
Jun. 30, 2012
Premiums on acquired deposits
Jun. 30, 2011
Premiums on acquired deposits
Dec. 31, 2011
Premiums on acquired deposits
GOODWILL AND OTHER INTANGIBLE ASSETS                  
Goodwill $ 337,438,000 $ 337,438,000 $ 337,438,000            
Market capitalization 3,470,000,000                
Total stockholders' equity 2,294,940,000 2,311,743,000 2,229,332,000 2,113,931,000          
Premiums on Acquired Deposits                  
Premiums on acquired deposits         115,300,000   115,300,000   117,600,000
Accumulated amortization for premiums on acquired deposits         53,800,000   53,800,000   50,400,000
Amortization expense of premiums on acquired deposits         2,800,000 3,100,000 5,700,000 6,300,000  
Estimated Future Amortization Expense of Premiums on Acquired Deposits                  
Remainder of the year             5,195,000    
Year Ending December 31, 2013             9,365,000    
Year Ending December 31, 2014             8,454,000    
Year Ending December 31, 2015             7,543,000    
Year Ending December 31, 2016             6,634,000    
Thereafter             24,289,000    
Total             $ 61,480,000