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GOODWILL AND OTHER INTANGIBLE ASSETS (Details 3) (Premiums on acquired deposits, USD $)
12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Premiums on acquired deposits
     
Premiums on Acquired Deposits      
Premiums on acquired deposits $ 100,200,000 $ 117,600,000  
Accumulated amortization for premiums on acquired deposits 43,900,000 50,400,000  
Number of specific premiums acquired on deposits removed 2    
Amortization expense of premiums on acquired deposits 10,900,000 12,300,000 13,300,000
Estimated Future Amortization Expense of Premiums on Acquired Deposits      
2013 9,365,000    
2014 8,454,000    
2015 7,543,000    
2016 6,634,000    
2017 5,722,000    
Thereafter 18,567,000    
Total $ 56,285,000