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Investments (Securities Gains (Losses)) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Investments [Abstract]    
Gross gains on sales of investment securities available for sale $ 4,933 $ 5,135
Gross losses on sales of investment securities available for sale (305) (9)
Total securities gains (losses) $ 4,628 $ 5,126