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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Held to Maturity    
Amortized cost $ 161,848 $ 931
Estimated fair value 162,528 976
Available for Sale    
Amortized cost 1,514,005 1,468,983
Gross unrealized gains 25,520 24,851
Gross unrealized losses (2,780) (840)
Total 1,536,745 1,492,994
U.S. Government sponsored entities mortgage-backed securities
   
Held to Maturity    
Amortized cost 161,848 931
Gross unrealized gains 695 45
Gross unrealized losses (15)  
Estimated fair value 162,528 976
Available for Sale    
Amortized cost 925,018 1,077,146
Gross unrealized gains 17,548 20,981
Gross unrealized losses (1,523) (825)
Total 941,043 1,097,302
U.S. Government sponsored entities debt securities
   
Available for Sale    
Amortized cost 278,198 370,184
Gross unrealized gains 2,741 2,993
Total 280,939 373,177
States and political subdivisions debt securities
   
Available for Sale    
Amortized cost 184,274 12,265
Gross unrealized gains 2,831 729
Gross unrealized losses (1,194)  
Total 185,911 12,994
Corporate securities
   
Available for Sale    
Amortized cost 125,649 8,403
Gross unrealized gains 2,360 148
Gross unrealized losses (63)  
Total 127,946 8,551
Other
   
Available for Sale    
Amortized cost 866 985
Gross unrealized gains 40  
Gross unrealized losses   (15)
Total $ 906 $ 970