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Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Total unrealized gains (losses) on debt securities available-for-sale, Gross Unrealized Gains $ 2,858 $ 5,645
Total unrealized gains (losses) on debt securities available-for-sale, Gross Unrealized Losses (12,950) (3,967)
Total unrealized gains (losses) on debt securities available-for-sale, Net Unrealized Gains/(Losses) (10,092) 1,678
Income tax (expense) benefit, Gross Unrealized Gains (607) (1,982)
Income tax (expense) benefit, Gross Unrealized Losses 2,750 1,393
Income tax (expense) benefit, Net Unrealized Gains/(Losses) 2,143 (589)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Gains 2,251 3,663
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Losses (10,200) (2,574)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Net Unrealized Gains/(Losses) $ (7,949) $ 1,089