Fair Value of Assets and Liabilities (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	$ 4,112,601	$ 6,533,874
Debt Securities Issued by the U.S. Treasury and Government Agencies
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	1,023,753	555,856
Debt Securities Issued by the U.S. Treasury and Government Agencies \| Quoted Prices in Active Markets for Identical Assets or Liabilities
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	933,539	553,894
Debt Securities Issued by the U.S. Treasury and Government Agencies \| Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	90,214	1,962
Debt Securities Issued by the U.S. Treasury and Government Agencies \| Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	1,023,753	555,856
Debt Securities Issued by States and Political Subdivisions
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	130,684	113,609
Debt Securities Issued by States and Political Subdivisions \| Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	130,684	113,609
Debt Securities Issued by States and Political Subdivisions \| Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	130,684	113,609
Debt Securities Issued by U.S. Government-Sponsored Enterprises
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale		505
Debt Securities Issued by U.S. Government-Sponsored Enterprises \| Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale		505
Debt Securities Issued by U.S. Government-Sponsored Enterprises \| Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale		505
Debt Securities Issued by Corporations
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	43,197
Debt Securities Issued by Corporations \| Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	43,197
Debt Securities Issued by Corporations \| Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	43,197
Mortgage-Backed Securities Issued by Government Agencies
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	2,835,051	5,750,028
Mortgage-Backed Securities Issued by Government Agencies \| Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	2,835,051	5,750,028
Mortgage-Backed Securities Issued by Government Agencies \| Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	2,835,051	5,750,028
Mortgage-Backed Securities Issued by U.S. Government-Sponsored Enterprises
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	79,916	113,876
Mortgage-Backed Securities Issued by U.S. Government-Sponsored Enterprises \| Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	79,916	113,876
Mortgage-Backed Securities Issued by U.S. Government-Sponsored Enterprises \| Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	79,916	113,876
Mortgage-Backed Securities
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	2,914,967	5,863,904
Mortgage-Backed Securities \| Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	2,914,967	5,863,904
Mortgage-Backed Securities \| Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	2,914,967	5,863,904
Quoted Prices in Active Markets for Identical Assets or Liabilities
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	933,539	553,894
Other Assets	11,863	10,851
Total Assets Measured at Fair Value on a Recurring Basis	945,402	564,745
Significant Other Observable Inputs
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	3,179,062	5,979,980
Net Derivative Assets and Liabilities	327	3,117
Total Assets Measured at Fair Value on a Recurring Basis	3,179,389	5,983,097
Significant Unobservable Inputs
Investment Securities Available-for-Sale:
Mortgage Servicing Rights	8,852	10,226
Net Derivative Assets and Liabilities	432	(332)
Total Assets Measured at Fair Value on a Recurring Basis	9,284	9,894
Total
Investment Securities Available-for-Sale:
Total Investment Securities Available-for-Sale	4,112,601	6,533,874
Mortgage Servicing Rights	8,852	10,226
Other Assets	11,863	10,851
Net Derivative Assets and Liabilities	759	2,785
Total Assets Measured at Fair Value on a Recurring Basis	$ 4,134,075	$ 6,557,736

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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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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- Definition

Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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