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Investment Securities - Trading Securities (Details) - Floating Interest Rate [Member] - Asset-backed Securities [Member] - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading Securities, Debt, Amortized Cost $ 2,006 $ 2,211
Trading, at fair value $ 383 $ 491
Trading Securities, Weighted-Average Yield 4.52% 4.41%