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Investment Securities Securities Gains and Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Proceeds from sales of securities $ 8,868 $ 35,465
Gross realized gains 536 1,395
Gross realized losses 0 0
Net gain 536 1,395
Related income taxes $ 188 $ 488