INVESTMENT SECURITIES (Aggregate Values And Unrealized Gains And Losses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Investments [Line Items]
Investment securities available for sale, cost	$ 4,029,858	$ 4,486,881
Investment securities available for sale, gross unrealized gains	28,454	34,618
Investment securities available for sale, gross unrealized losses	1,889	11,423
Total investment securities available for sale, fair value	4,056,423	4,510,076
Investment securities held to maturity, cost	1,822	2,532
Investment securities held to maturity, fair value	1,980	2,741
U. S. Treasury [Member]
Schedule of Investments [Line Items]
Investment securities available for sale, cost	887,041	1,935,666
Investment securities available for sale, gross unrealized gains	808	4,041
Investment securities available for sale, gross unrealized losses	30	307
Total investment securities available for sale, fair value	887,819	1,939,400
Government Agency Securities [Member]
Schedule of Investments [Line Items]
Investment securities available for sale, cost	2,591,974	1,930,469
Investment securities available for sale, gross unrealized gains	1,747	361
Investment securities available for sale, gross unrealized losses	1,512	10,844
Total investment securities available for sale, fair value	2,592,209	1,919,986
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Investment securities available for sale, cost	250,476	479,160
Investment securities available for sale, gross unrealized gains	2,344	7,498
Investment securities available for sale, gross unrealized losses	0	0
Total investment securities available for sale, fair value	252,820	486,658
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Investment securities available for sale, cost	298,402	139,291
Investment securities available for sale, gross unrealized gains	9,165	4,522
Investment securities available for sale, gross unrealized losses	346	268
Total investment securities available for sale, fair value	307,221	143,545
Investment securities held to maturity, cost	1,822	2,532
Investment securities held to maturity, gross unrealized gains	184	235
Investment securities held to maturity, gross unrealized losses	26	26
Investment securities held to maturity, fair value	1,980	2,741
Equity Securities [Member]
Schedule of Investments [Line Items]
Investment securities available for sale, cost	939	1,055
Investment securities available for sale, gross unrealized gains	14,374	18,176
Investment securities available for sale, gross unrealized losses	0	0
Total investment securities available for sale, fair value	15,313	19,231
State, County, Municipal [Member]
Schedule of Investments [Line Items]
Investment securities available for sale, cost	1,026	1,240
Investment securities available for sale, gross unrealized gains	16	20
Investment securities available for sale, gross unrealized losses	1	4
Total investment securities available for sale, fair value	$ 1,041	$ 1,256

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

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Reference 12: http://www.xbrl.org/2003/role/presentationRef

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- Definition

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- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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