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Investments (Securities Gains (Losses)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investments [Abstract]      
Gross gains on sales of investment securities available for sale $ 10,834 $ 29,129 $ 0
Gross losses on sales of investment securities available for sale (17) (33) 0
Total securities gains (losses) $ 10,817 $ 29,096 $ 0