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Securities Fair Value Option Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Fair Value Option Securities [Line Items]    
Fair Value Option Securities, Fair Value $ 77,046 $ 444,217
U.S. government agency residential mortgage-backed securities [Member]    
Schedule of Fair Value Option Securities [Line Items]    
Fair Value Option Securities, Fair Value 77,046 444,217
Fair Value Option Securities, Net Unrealized Gain (Loss) $ (1,777) $ (2,060)