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Investment Securities Available-for-Sale Detail of Sale of Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities [Abstract]      
Proceeds from sales $ 16,946 $ 36,582 $ 0
Gross gains on sales 54 1,050 0
Gross losses on sales $ 7 $ 827 $ 0