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INVESTMENT SECURITIES (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Held to Maturity, Amortized Cost          
Mortgage-backed securities $ 262,778   $ 262,778    
Held to Maturity, Estimated Fair Value          
Mortgage-backed securities 259,150   259,150    
Available for Sale, Amortized Cost          
Due in one year or less 2,567   2,567    
Due after one year through five years 76,206   76,206    
Due after five years through ten years 96,501   96,501    
Due after ten years 112,079   112,079    
Total 1,269,531   1,269,531    
Available for Sale, Estimated Fair Value          
Due in one year or less 2,660   2,660    
Due after one year through five years 77,321   77,321    
Due after five years through ten years 96,678   96,678    
Due after ten years 111,160   111,160    
Estimated fair value 1,274,312   1,274,312   $ 1,229,018
Available for sale          
Gross proceeds from sale of available for sale investment securities 117,500 $ 162,500 117,496 $ 162,470  
Gross realized gains on the sales of the available for sale investment securities   900      
Gross realized losses on the sales of the available for sale investment securities 1,900 $ 700      
Investment securities pledged to party with no right to sell or repledge the collateral 959,000   959,000   900,500
Residential - U.S. Government sponsored entities          
Held to Maturity, Amortized Cost          
Mortgage-backed securities 166,200   166,200    
Held to Maturity, Estimated Fair Value          
Mortgage-backed securities 163,230   163,230    
Available for Sale, Amortized Cost          
Mortgage-backed securities 776,223   776,223    
Available for Sale, Estimated Fair Value          
Mortgage-backed securities 778,067   778,067    
Estimated fair value 778,067   778,067   751,558
Commercial - U.S. Government sponsored entities          
Held to Maturity, Amortized Cost          
Mortgage-backed securities 96,578   96,578    
Held to Maturity, Estimated Fair Value          
Mortgage-backed securities 95,920   95,920    
Residential - Non-government agencies          
Available for Sale, Amortized Cost          
Mortgage-backed securities 69,603   69,603    
Available for Sale, Estimated Fair Value          
Mortgage-backed securities 70,357   70,357    
Estimated fair value 70,357   70,357   46,693
Commercial - Non-government agencies          
Available for Sale, Amortized Cost          
Mortgage-backed securities 135,535   135,535    
Available for Sale, Estimated Fair Value          
Mortgage-backed securities 137,151   137,151    
Estimated fair value 137,151   137,151   137,641
Other          
Available for Sale, Amortized Cost          
Other 817   817    
Available for Sale, Estimated Fair Value          
Other 918   918    
Estimated fair value $ 918   $ 918   $ 877