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Securities - Summarizes Securities Held for Investment and Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Marketable Securities [Abstract]
Held for investment, at cost (fair value: $14,654)	$ 14,511
Available for sale, at fair value	505,913
Total	$ 520,424	$ 562,542	$ 575,034

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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