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INVESTMENT SECURITIES (Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value $ 664,243 $ 1,547,490
Investment securities available for sale, 12 months or more, fair value 9,433 1,390
Investment securities available for sale, total fair value 673,676 1,548,880
Investment securities available for sale, less than 12 months, unrealized losses 581 1,846
Investment securities available for sale, 12 months or more, unrealized losses 127 43
Investment securities available for sale, total unrealized losses 708 1,889
Investment securities held to maturity, less than 12 months, fair value 0 0
Investment securities held to maturity, 12 months or more, fair value 17 21
Investment securities held to maturity, total fair value 17 21
Investment securities held to maturity, less than 12 months, unrealized losses 0 0
Investment securities held to maturity, 12 months or more, unrealized losses 27 26
Investment securities held to maturity, total unrealized losses 27 26
U. S. Treasury [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 120,045 151,269
Investment securities available for sale, 12 months or more, fair value 0 0
Investment securities available for sale, total fair value 120,045 151,269
Investment securities available for sale, less than 12 months, unrealized losses 12 30
Investment securities available for sale, 12 months or more, unrealized losses 0 0
Investment securities available for sale, total unrealized losses 12 30
Government Agency Securities [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 407,498 1,336,763
Investment securities available for sale, 12 months or more, fair value 0 0
Investment securities available for sale, total fair value 407,498 1,336,763
Investment securities available for sale, less than 12 months, unrealized losses 337 1,512
Investment securities available for sale, 12 months or more, unrealized losses 0 0
Investment securities available for sale, total unrealized losses 337 1,512
Residential Mortgage-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 135,880 59,458
Investment securities available for sale, 12 months or more, fair value 9,433 1,380
Investment securities available for sale, total fair value 145,313 60,838
Investment securities available for sale, less than 12 months, unrealized losses 214 304
Investment securities available for sale, 12 months or more, unrealized losses 127 42
Investment securities available for sale, total unrealized losses 341 346
Investment securities held to maturity, less than 12 months, fair value 0 0
Investment securities held to maturity, 12 months or more, fair value 17 21
Investment securities held to maturity, total fair value 17 21
Investment securities held to maturity, less than 12 months, unrealized losses 0 0
Investment securities held to maturity, 12 months or more, unrealized losses 27 26
Investment securities held to maturity, total unrealized losses 27 26
State, County, Municipal [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value   0
Investment securities available for sale, 12 months or more, fair value   10
Investment securities available for sale, total fair value   10
Investment securities available for sale, less than 12 months, unrealized losses   0
Investment securities available for sale, 12 months or more, unrealized losses   1
Investment securities available for sale, total unrealized losses   1
Corporate Bonds [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 820  
Investment securities available for sale, 12 months or more, fair value 0  
Investment securities available for sale, total fair value 820  
Investment securities available for sale, less than 12 months, unrealized losses 18  
Investment securities available for sale, 12 months or more, unrealized losses 0  
Investment securities available for sale, total unrealized losses $ 18