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Securities - Summary of Securities Held for Investment and Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Marketable Securities [Abstract]    
Held for investment, at cost (fair value: $4,038 and $4,403, respectively) $ 4,003 $ 4,365
Available for sale, at fair value 459,247 465,468
Total $ 463,250 $ 469,833