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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Held to Maturity    
Amortized Cost $ 242,141 $ 252,047
Estimated Fair Value 235,929 238,705
Available for Sale    
Amortized Cost 1,179,649 1,433,296
Gross Unrealized Gains 15,481 9,469
Gross Unrealized Losses (10,566) (34,766)
Total 1,184,564 1,407,999
States and political subdivisions debt securities
   
Available for Sale    
Amortized Cost 191,553 191,158
Gross Unrealized Gains 1,844 305
Gross Unrealized Losses (3,238) (12,106)
Total 190,159 179,357
Corporations debt securities
   
Available for Sale    
Amortized Cost 84,331 157,337
Gross Unrealized Gains 1,427 1,878
Gross Unrealized Losses (206) (1,120)
Total 85,552 158,095
U.S. Government sponsored entities mortgage-backed securities
   
Held to Maturity    
Amortized Cost 242,141 252,047
Gross Unrealized Gains 63  
Gross Unrealized Losses (6,275) (13,342)
Estimated Fair Value 235,929 238,705
Available for Sale    
Amortized Cost 737,504 936,144
Gross Unrealized Gains 8,780 7,085
Gross Unrealized Losses (5,745) (15,603)
Total 740,539 927,626
Non-agency collateralized mortgage obligations mortgage-backed securities
   
Available for Sale    
Amortized Cost 165,518 147,902
Gross Unrealized Gains 3,320 81
Gross Unrealized Losses (1,377) (5,937)
Total 167,461 142,046
Other
   
Available for Sale    
Amortized Cost 743 755
Gross Unrealized Gains 110 120
Total $ 853 $ 875