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INVESTMENT SECURITIES (Details 2) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Available for Sale, Amortized Cost    
Due in one year or less $ 110,289,000  
Due after one year through five years 176,722,000  
Due after five years through ten years 96,482,000  
Due after ten years 143,027,000  
Mortgage-backed securities 991,876,000  
Other 751,000  
Total 1,519,147,000  
Available for Sale, Estimated Fair Value    
Due in one year or less 110,667,000  
Due after one year through five years 181,273,000  
Due after five years through ten years 96,745,000  
Due after ten years 142,574,000  
Mortgage-backed securities 1,004,990,000  
Other 816,000  
Total 1,537,065,000 1,536,745,000
Held to Maturity, Amortized Cost    
Mortgage-backed securities 159,363,000  
Held to Maturity, Estimated Fair Value    
Mortgage-backed securities 159,483,000  
Available for sale    
Investment securities pledged to party with no right to sell or repledge the collateral 863,900,000 905,500,000
Investment securities pledged to party with right to sell or repledge the collateral $ 0 $ 0