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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Held to Maturity    
Amortized Cost $ 248,788 $ 252,047
Estimated Fair Value 238,782 238,705
Available for Sale    
Amortized Cost 1,417,537 1,433,296
Gross Unrealized Gains 11,674 9,469
Gross Unrealized Losses (21,087) (34,766)
Total 1,408,124 1,407,999
States and political subdivisions debt securities
   
Available for Sale    
Amortized Cost 191,556 191,158
Gross Unrealized Gains 861 305
Gross Unrealized Losses (7,291) (12,106)
Total 185,126 179,357
Corporations debt securities
   
Available for Sale    
Amortized Cost 156,686 157,337
Gross Unrealized Gains 2,332 1,878
Gross Unrealized Losses (727) (1,120)
Total 158,291 158,095
U.S. Government sponsored entities mortgage-backed securities
   
Held to Maturity    
Amortized Cost 248,788 252,047
Gross Unrealized Losses (10,006) (13,342)
Estimated Fair Value 238,782 238,705
Available for Sale    
Amortized Cost 902,088 936,144
Gross Unrealized Gains 6,948 7,085
Gross Unrealized Losses (9,970) (15,603)
Total 899,066 927,626
Non-agency collateralized mortgage obligations mortgage-backed securities
   
Available for Sale    
Amortized Cost 166,535 147,902
Gross Unrealized Gains 1,423 81
Gross Unrealized Losses (3,099) (5,937)
Total 164,859 142,046
Other
   
Available for Sale    
Amortized Cost 672 755
Gross Unrealized Gains 110 120
Total $ 782 $ 875