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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified

Jun. 30, 2012

Dec. 31, 2011

Financial Assets:

Mortgage servicing rights

$ 136,562

$ 117,012

Carrying Value

Financial Assets:

Cash and cash equivalents

3,160,673

2,001,737

Securities held to maturity

3,853,587

3,815,854

424,269

490,228

30,878,507

30,152,154

Mortgage servicing rights

386

596

Financial Liabilities:

24,996,649

22,274,130

12,588,612

13,960,413

Estimated Fair Value

Financial Assets:

Cash and cash equivalents

3,160,673

2,001,737

Securities held to maturity

4,032,094

3,966,185

424,269

490,228

31,542,898

30,755,121

Mortgage servicing rights

386

596

Financial Liabilities:

25,031,061

22,321,011

14,064,634

15,423,474

Quoted Prices in Active Markets for Identical Assets (Level 1)

Financial Assets:

Cash and cash equivalents

3,160,673

2,001,737

Financial Liabilities:

15,143,947

^[1]

14,900,867

^[1]

Significant Other Observable Inputs (Level 2)

Financial Assets:

Securities held to maturity

3,978,381

3,890,970

424,269

490,228

Financial Liabilities:

9,887,114

^[2]

7,420,144

^[2]

14,064,634

15,423,474

Significant Unobservable Inputs (Level 3)

Financial Assets:

Securities held to maturity

53,713

75,215

31,542,898

30,755,121

Mortgage servicing rights

$ 386

$ 596

[1]	Includes NOW and money market accounts, savings accounts, and non-interest-bearing accounts.
[2]	Represents certificates of deposit.

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.

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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 investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity.

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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 loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

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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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