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Securities Available-for-Sale - Unrealized Gains (Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains $ 6,975 $ 10,754
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses (3,968) (3,472)
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains 3,007 7,282
Income tax expense/(benefit), Gross Unrealized Gains (2,450) (3,776)
Income tax expense/(benefit), Gross Unrealized Losses 1,394 1,219
Income tax expense/(benefit), Net Unrealized Gains (1,056) (2,557)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss) 4,525 6,978
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss) (2,574) (2,253)
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax $ 1,951 $ 4,725