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Securities - Summary of Securities Held for Investment and Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Marketable Securities [Abstract]
Held for investment at cost (fair value: $12,094 and $16,689, respectively)	$ 11,986	$ 16,416
Available for sale, at fair value	515,641	546,126
Total	$ 527,627	$ 562,542

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- Definition

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

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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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