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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, 2014
Dec. 31, 2013
Marketable Securities [Abstract]    
Held for investment at cost (fair value: $8,671 and $12,094, respectively) $ 8,593us-gaap_HeldToMaturitySecurities $ 11,986us-gaap_HeldToMaturitySecurities
Available for sale, at fair value 516,190us-gaap_AvailableForSaleSecurities 515,641us-gaap_AvailableForSaleSecurities
Total $ 524,783us-gaap_MarketableSecurities $ 527,627us-gaap_MarketableSecurities