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Fair Value of Financial Instruments (Detail) - Quantitative information regarding the assumptions used for valuing Level 3 assets (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Mar. 31, 2013

Collateralized Debt Obligations [Member] | Minimum [Member] | Discount Margin To LIBOR [Member]

10.50%

Collateralized Debt Obligations [Member] | Minimum [Member] | Constant Default Rate [Member]

0.25%

Collateralized Debt Obligations [Member] | Minimum [Member] | Default Percentage [Member]

8.06%

Collateralized Debt Obligations [Member] | Maximum [Member] | Discount Margin To LIBOR [Member]

16.80%

Collateralized Debt Obligations [Member] | Maximum [Member] | Constant Default Rate [Member]

0.84%

Collateralized Debt Obligations [Member] | Maximum [Member] | Default Percentage [Member]

48.92%

Collateralized Debt Obligations [Member] | Weighted Average [Member] | Discount Margin To LIBOR [Member]

12.19%

Collateralized Debt Obligations [Member] | Weighted Average [Member] | Constant Default Rate [Member]

0.39%

Collateralized Debt Obligations [Member] | Weighted Average [Member] | Default Percentage [Member]

31.26%

Collateralized Debt Obligations [Member] | Discount Margin To LIBOR [Member]

Fair Value (in Dollars)

3,504

^[1]

Discounted cash flow

Collateralized Debt Obligations [Member]

Fair Value (in Dollars)

3,504

Mortgage Servicing Rights [Member] | Constant Prepayment Rate [Member]

Fair Value (in Dollars)

15,297

^[1]

Discounted cash flow

14.60%

Mortgage Servicing Rights [Member] | Discount Rate [Member]

10.43%

Mortgage Servicing Rights [Member] | Delinquency Percentage [Member]

1.63%

[1]	Other level 3 securities totaling $1.6 million are valued based on data provided by the issuer

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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