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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for Sale    
Amortized cost $ 1,469,257 $ 1,468,983
Gross unrealized gains 30,990 24,851
Gross unrealized losses (701) (840)
Estimated fair value 1,499,546 1,492,994
Held to Maturity    
Amortized cost 163,733 931
Estimated fair value 165,012 976
U.S. Government sponsored entities debt securities
   
Available for Sale    
Amortized cost 313,675 370,184
Gross unrealized gains 3,322 2,993
Estimated fair value 316,997 373,177
States and political subdivisions debt securities
   
Available for Sale    
Amortized cost 159,913 12,265
Gross unrealized gains 3,397 729
Gross unrealized losses (486)  
Estimated fair value 162,824 12,994
U.S. Government sponsored entities mortgage-backed securities
   
Available for Sale    
Amortized cost 945,751 1,077,146
Gross unrealized gains 22,163 20,981
Gross unrealized losses (215) (825)
Estimated fair value 967,699 1,097,302
Held to Maturity    
Amortized cost 163,733 931
Gross unrealized gains 1,279 45
Estimated fair value 165,012 976
Corporate securities
   
Available for Sale    
Amortized cost 49,069 8,403
Gross unrealized gains 2,060 148
Estimated fair value 51,129 8,551
Other
   
Available for Sale    
Amortized cost 849 985
Gross unrealized gains 48  
Gross unrealized losses   (15)
Estimated fair value $ 897 $ 970