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Investment Securities, Gains, Losses, and Proceeds (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Gross gains on available for sale securities $ 0 $ 9,485 $ 12,270
Gross gains on held to maturity securities 439 33 0
Total Gains 439 9,518 12,270
Gross losses on available for sale securities 0 202 4,137
Gross losses on held to maturity securities (5) 0 0
Total losses (5) (202) (4,137)
Investment securities gains, net 434 9,316 8,133
Proceeds from Sale of Available-for-sale Securities $ 18,467 $ 549,555 $ 1,601,947