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INVESTMENT SECURITIES (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
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Sep. 30, 2012
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Sep. 30, 2011
Dec. 31, 2011
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Available for Sale, Amortized Cost        
Due in one year or less $ 185,755,000 $ 185,755,000    
Due after one year through five years 156,724,000 156,724,000    
Due after five years through ten years 54,947,000 54,947,000    
Due after ten years 125,231,000 125,231,000    
Mortgage-backed securities 945,751,000 945,751,000    
Other 849,000 849,000    
Total 1,469,257,000 1,469,257,000    
Available for Sale, Estimated Fair Value        
Due in one year or less 186,405,000 186,405,000    
Due after one year through five years 160,820,000 160,820,000    
Due after five years through ten years 56,418,000 56,418,000    
Due after ten years 127,307,000 127,307,000    
Mortgage-backed securities 967,699,000 967,699,000    
Other 897,000 897,000    
Total 1,499,546,000 1,499,546,000   1,492,994,000
Held to Maturity, Amortized Cost        
Mortgage-backed securities 163,733,000 163,733,000    
Held to Maturity, Estimated Fair Value        
Mortgage-backed securities 165,012,000 165,012,000    
Available-for-sale mortgage-backed securities sold 124,700,000      
Average net yield of available-for-sale mortgage-backed securities sold (as a percent) 0.60%      
Weighted average life of available-for-sale mortgage-backed securities sold 1 year 3 months 18 days      
Held-to-maturity security purchased on repositioning 133,200,000      
Average yield of held-to-maturity securities (as a percent) 1.88%      
Weighted average life of held-to-maturity securities 5 years 3 months 18 days      
Net pre-tax gain 700,000      
Other disclosures        
Gross proceeds from sale of available for sale investment securities 127,381,000 130,076,000 5,324,000  
Gross realized gains on the sales of the available for sale investment securities 1,700,000 1,700,000 300,000  
Gross realized losses on the sales of the available for sale investment securities 900,000 900,000    
Investment securities pledged to party with no right to sell or repledge the collateral $ 869,600,000 $ 869,600,000   $ 938,000,000
Number of investment securities in an unrealized loss position 59 59   9