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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available for Sale    
Amortized cost $ 1,519,147 $ 1,514,005
Gross unrealized gains 22,804 25,520
Gross unrealized losses (4,886) (2,780)
Total 1,537,065 1,536,745
Held to Maturity    
Amortized cost 159,363 161,848
Estimated fair value 159,483 162,528
U.S. Government sponsored entities debt securities
   
Available for Sale    
Amortized cost 207,755 278,198
Gross unrealized gains 2,343 2,741
Total 210,098 280,939
States and political subdivisions debt securities
   
Available for Sale    
Amortized cost 193,648 184,274
Gross unrealized gains 2,022 2,831
Gross unrealized losses (2,044) (1,194)
Total 193,626 185,911
U.S. Government sponsored entities mortgage-backed securities
   
Available for Sale    
Amortized cost 981,911 925,018
Gross unrealized gains 15,876 17,548
Gross unrealized losses (2,781) (1,523)
Total 995,006 941,043
Held to Maturity    
Amortized cost 159,363 161,848
Gross unrealized gains 452 695
Gross unrealized losses (332) (15)
Estimated fair value 159,483 162,528
Corporate securities
   
Available for Sale    
Amortized cost 125,117 125,649
Gross unrealized gains 2,479 2,360
Gross unrealized losses (61) (63)
Total 127,535 127,946
Non-agency collateralized mortgage obligations
   
Available for Sale    
Amortized cost 9,965  
Gross unrealized gains 19  
Total 9,984  
Other
   
Available for Sale    
Amortized cost 751 866
Gross unrealized gains 65 40
Total $ 816 $ 906