Carrying or Notional Amounts and Estimated Fair Values for Financial Instruments (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Non Covered under Loss Sharing Agreements With FDIC \| Carrying (Reported) Amount, Fair Value Disclosure
Financial Assets:
Loans	$ 19,971,267	$ 19,934,810
Covered under Loss Sharing Agreements with FDIC \| Carrying (Reported) Amount, Fair Value Disclosure
Financial Assets:
Loans	4,556,155	4,836,882
Carrying (Reported) Amount, Fair Value Disclosure
Financial Assets:
Cash and money market investments	1,971,857	1,431,668
Trading account securities	785,842	546,713
Investment securities available-for-sale	5,389,491	5,236,852
Investment securities held-to-maturity	129,910	122,354
Other investment securities	174,560	163,513
Loans held-for-sale	509,046	893,938
FDIC loss share asset	2,350,176	2,318,183
Financial Liabilities:
Deposits	27,960,429	26,762,200
Federal funds purchased and assets sold under agreements to repurchase	2,570,322	2,412,550
Other short-term borrowings	151,302	364,222
Notes payable	3,423,286	4,170,183
Carrying (Reported) Amount, Fair Value Disclosure \| Equity appreciation instrument
Financial Liabilities:
Equity appreciation instrument		9,945
Non Covered under Loss Sharing Agreements With FDIC \| Estimate of Fair Value, Fair Value Disclosure
Financial Assets:
Loans	17,100,724	17,137,805
Covered under Loss Sharing Agreements with FDIC \| Estimate of Fair Value, Fair Value Disclosure
Financial Assets:
Loans	4,215,746	4,744,680
Estimate of Fair Value, Fair Value Disclosure
Financial Assets:
Cash and money market investments	1,971,857	1,431,668
Trading account securities	785,842	546,713
Investment securities available-for-sale	5,389,491	5,236,852
Investment securities held-to-maturity	136,959	120,873
Other investment securities	176,114	165,233
Loans held-for-sale	512,144	902,371
FDIC loss share asset	2,278,222	2,383,122
Financial Liabilities:
Deposits	28,082,567	26,873,408
Federal funds purchased and assets sold under agreements to repurchase	2,704,531	2,503,320
Other short-term borrowings	151,302	364,222
Notes payable	3,336,391	4,067,818
Commitments to extend credit	2,693	983
Letters of credit	2,924	3,318
Estimate of Fair Value, Fair Value Disclosure \| Equity appreciation instrument
Financial Liabilities:
Equity appreciation instrument		9,945
Notional Amount
Financial Liabilities:
Commitments to extend credit	6,626,323	5,879,051
Letters of credit	$ 155,483	$ 152,596

This element represents the aggregate carrying amount of investment in equities and other securities that do not have readily determinable fair values. The carrying amount of such securities equals cost, adjusted for other than temporary impairment. Includes investments in stock of the Federal Home Loan Bank and Federal Reserve Bank.

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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.

+ References

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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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

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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 Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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-Publisher FASB
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