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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 |

X
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