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Securities - Trading Account Securities, at Estimated Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading account securities $ 16,596 $ 15,426
U.S. Treasury [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading account securities 15,639 15,339
States and political subdivisions [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading account securities $ 957 $ 87