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Securities - Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Reclassification adjustment for other-than-temporary impairment loss recognized in income $ 0 $ 0 $ 49