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Securities - Summary of Securities Held for Investment and Securities Available for Sale (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Marketable Securities [Abstract]    
Held for investment at fair value $ 8,671us-gaap_HeldToMaturitySecuritiesFairValue $ 12,094us-gaap_HeldToMaturitySecuritiesFairValue