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Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Available-for-sale Securities, Gross Realized Gains $ 572 $ 236 $ 1,174 $ 1,310
Available-for-sale Securities, Gross Realized Losses 0 0 0 (10)
Investment securities gains, net $ 572 $ 236 $ 1,174 $ 1,300