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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Available for Sale    
Amortized Cost $ 1,516,157 $ 1,514,005
Gross Unrealized Gains 14,827 25,520
Gross Unrealized Losses (29,036) (2,780)
Total 1,501,948 1,536,745
Held to Maturity    
Amortized Cost 255,663 161,848
Estimated Fair Value 245,519 162,528
U.S. Government sponsored entities debt securities
   
Available for Sale    
Amortized Cost 127,124 278,198
Gross Unrealized Gains 1,268 2,741
Total 128,392 280,939
States and political subdivisions debt securities
   
Available for Sale    
Amortized Cost 190,715 184,274
Gross Unrealized Gains 383 2,831
Gross Unrealized Losses (11,074) (1,194)
Total 180,024 185,911
Corporations debt securities
   
Available for Sale    
Amortized Cost 140,119 125,649
Gross Unrealized Gains 1,586 2,360
Gross Unrealized Losses (1,702) (63)
Total 140,003 127,946
U.S. Government sponsored entities mortgage-backed securities
   
Available for Sale    
Amortized Cost 974,008 925,018
Gross Unrealized Gains 11,221 17,548
Gross Unrealized Losses (11,884) (1,523)
Total 973,345 941,043
Held to Maturity    
Amortized Cost 255,663 161,848
Gross Unrealized Gains 19 695
Gross Unrealized Losses (10,163) (15)
Estimated Fair Value 245,519 162,528
Non-agency collateralized mortgage obligations mortgage-backed securities
   
Available for Sale    
Amortized Cost 83,449  
Gross Unrealized Gains 273  
Gross Unrealized Losses (4,376)  
Total 79,346  
Other
   
Available for Sale    
Amortized Cost 742 866
Gross Unrealized Gains 96 40
Total $ 838 $ 906