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Securities - Summary of Securities Held for Investment and Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Marketable Securities [Abstract]
Held for investment, at cost (fair value: $7,991 and $8,671, respectively)	$ 7,923	$ 8,593
Available for sale, at fair value	529,396	516,190
Total	$ 537,319	$ 524,783

X

- Definition

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

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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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