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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Held to Maturity, Amortized Cost          
Mortgage-backed securities     $ 247,917    
Held to Maturity, Estimated Fair Value          
Mortgage-backed securities     244,136    
Available for Sale, Amortized Cost          
Due in one year or less     15,596    
Due after one year through five years     106,255    
Due after five years through ten years     73,452    
Due after ten years     99,970    
Mortgage-backed securities     971,382    
Other     848    
Total     1,267,503    
Available for Sale, Estimated Fair Value          
Due in one year or less     15,797    
Due after one year through five years     107,125    
Due after five years through ten years     74,980    
Due after ten years     101,142    
Mortgage-backed securities     972,295    
Other     916    
Total     1,272,255 $ 1,229,018  
Available for sale          
Gross proceeds from sale of available for sale investment securities $ 119,400 $ 162,500 117,496 162,470 $ 271,931
Purchases of investment securities available for sale $ 120,600   344,766 98,408 753,496
Gross realized gains on the sales of the available for sale investment securities   900 0 900 3,900
Gross realized losses on the sales of the available for sale investment securities   $ 700 1,900 700 $ 3,400
Average net yield of available for sale mortgage backed securities sold 1.35% 2.69%      
Weighted average life of available for sale mortgage backed securities sold 4 years 4 months 24 days 5 years 8 months 12 days      
Net realized gains on the sales of the available for sale investment securities $ 1,900        
Investment securities pledged to party with no right to sell or repledge the collateral     $ 1,000,000 $ 900,500  
Non Agency Commercial Mortgage Backed Securities and Corporate Bond Securities          
Available for sale          
Average net yield of available for sale mortgage backed securities sold 2.71%        
Weighted average life of available for sale mortgage backed securities sold 7 years 7 months 6 days