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INVESTMENT SECURITIES (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Held to Maturity, Amortized Cost        
Mortgage-backed securities $ 242,141,000   $ 242,141,000  
Held to Maturity, Estimated Fair Value        
Mortgage-backed securities 235,929,000   235,929,000  
Available for Sale, Amortized Cost        
Due in one year or less 3,471,000   3,471,000  
Due after one year through five years 53,494,000   53,494,000  
Due after five years through ten years 99,948,000   99,948,000  
Due after ten years 118,971,000   118,971,000  
Mortgage-backed securities 903,022,000   903,022,000  
Other 743,000   743,000  
Total 1,179,649,000   1,179,649,000  
Available for Sale, Estimated Fair Value        
Due in one year or less 3,471,000   3,471,000  
Due after one year through five years 54,842,000   54,842,000  
Due after five years through ten years 99,847,000   99,847,000  
Due after ten years 117,551,000   117,551,000  
Mortgage-backed securities 908,000,000   908,000,000  
Other 853,000   853,000  
Total 1,184,564,000   1,184,564,000 1,407,999,000
Available for sale        
Gross proceeds from sale of available for sale investment securities   162,500,000 162,470,000  
Gross realized gains on the sales of the available for sale investment securities 900,000   900,000  
Gross realized losses on the sales of the available for sale investment securities 700,000   700,000  
Investment securities pledged to party with no right to sell or repledge the collateral 894,100,000   894,100,000 914,100,000
Investment securities pledged to party with right to sell or repledge the collateral $ 0   $ 0 $ 0