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Securities Available for Sale - Gross realized losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]    
Proceeds $ 59,689 $ 63,198
Gross realized gains 58 58
Gross realized losses $ 0 $ 1