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Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale Securities, Gross Realized Gains $ 373 $ 730
Available-for-sale Securities, Gross Realized Losses 0 (9)
Investment securities gains, net $ 373 $ 721