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INVESTMENT SECURITIES (Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value $ 1,547,490 $ 1,997,365
Investment securities available for sale, 12 months or more, fair value 1,390 543
Investment securities available for sale, total fair value 1,548,880 1,997,908
Investment securities available for sale, less than 12 months, unrealized losses 1,846 11,403
Investment securities available for sale, 12 months or more, unrealized losses 43 20
Investment securities available for sale, total unrealized losses 1,889 11,423
Investment securities held to maturity, less than 12 months, fair value 0 0
Investment securities held to maturity, 12 months or more, fair value 21 26
Investment securities held to maturity, total fair value 21 26
Investment securities held to maturity, less than 12 months, unrealized losses 0 0
Investment securities held to maturity, 12 months or more, unrealized losses 26 26
Investment securities held to maturity, total unrealized losses 26 26
U. S. Treasury [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 151,269 301,190
Investment securities available for sale, 12 months or more, fair value 0 0
Investment securities available for sale, total fair value 151,269 301,190
Investment securities available for sale, less than 12 months, unrealized losses 30 307
Investment securities available for sale, 12 months or more, unrealized losses 0 0
Investment securities available for sale, total unrealized losses 30 307
Government Agency Securities [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 1,336,763 1,684,149
Investment securities available for sale, 12 months or more, fair value 0 0
Investment securities available for sale, total fair value 1,336,763 1,684,149
Investment securities available for sale, less than 12 months, unrealized losses 1,512 10,843
Investment securities available for sale, 12 months or more, unrealized losses 0 0
Investment securities available for sale, total unrealized losses 1,512 10,843
Residential Mortgage-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 59,458 11,496
Investment securities available for sale, 12 months or more, fair value 1,380 523
Investment securities available for sale, total fair value 60,838 12,019
Investment securities available for sale, less than 12 months, unrealized losses 304 249
Investment securities available for sale, 12 months or more, unrealized losses 42 20
Investment securities available for sale, total unrealized losses 346 269
Investment securities held to maturity, less than 12 months, fair value 0 0
Investment securities held to maturity, 12 months or more, fair value 21 26
Investment securities held to maturity, total fair value 21 26
Investment securities held to maturity, less than 12 months, unrealized losses 0 0
Investment securities held to maturity, 12 months or more, unrealized losses 26 26
Investment securities held to maturity, total unrealized losses 26 26
State, County, Municipal [Member]
   
Schedule of Investments [Line Items]    
Investment securities available for sale, less than 12 months, fair value 0 530
Investment securities available for sale, 12 months or more, fair value 10 20
Investment securities available for sale, total fair value 10 550
Investment securities available for sale, less than 12 months, unrealized losses 0 4
Investment securities available for sale, 12 months or more, unrealized losses 1 0
Investment securities available for sale, total unrealized losses $ 1 $ 4