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INVESTMENT SECURITIES (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Held to Maturity, Amortized Cost          
Mortgage-backed securities $ 252,047,000   $ 252,047,000    
Held to Maturity, Estimated Fair Value          
Mortgage-backed securities 238,705,000   238,705,000    
Available for Sale, Amortized Cost          
Due after one year through five years 87,349,000   87,349,000    
Due after five years through ten years 134,337,000   134,337,000    
Due after ten years 126,809,000   126,809,000    
Mortgage-backed securities 1,084,046,000   1,084,046,000    
Other 755,000   755,000    
Total 1,433,296,000   1,433,296,000    
Available for Sale, Estimated Fair Value          
Due after one year through five years 88,819,000   88,819,000    
Due after five years through ten years 131,223,000   131,223,000    
Due after ten years 117,410,000   117,410,000    
Mortgage-backed securities 1,069,672,000   1,069,672,000    
Other 875,000   875,000    
Total 1,407,999,000   1,407,999,000 1,536,745,000  
Available for sale          
Gross proceeds from sale of available for sale investment securities 271,500,000 124,700,000 271,931,000 130,076,000 137,980,000
Gross realized gains on the sales of the available for sale investment securities   700,000 3,900,000 1,700,000 1,400,000
Gross realized losses on the sales of the available for sale investment securities     3,400,000 900,000 100,000
Average net yield of available for sale mortgage backed securities sold (as a percent) 1.87% 0.60%      
Weighted average life of available for sale mortgage backed securities sold 2 years 10 months 24 days 1 year 3 months 18 days      
Investment in available-for-sale securities 242,500,000        
Net realized gains on the sales of the available for sale investment securities 500,000        
Investment in held to maturity investments   133,200,000      
Average yield of held to maturity investments (as a percent)   1.88%      
Weighted average life of held to maturity   5 years 3 months 18 days      
Investment securities pledged to party with no right to sell or repledge the collateral $ 914,100,000   $ 914,100,000 $ 905,500,000  
Non-agency commercial mortgage-backed securities and corporate bond securities
          
Available for sale          
Average net yield of available for sale mortgage backed securities sold (as a percent) 3.21%        
Weighted average life of available for sale mortgage backed securities sold 7 years 4 months 24 days