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Securities Available-for-Sale - Unrealized Gains (Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains $ 9,925 $ 10,754
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses (2,443) (3,472)
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains/(Losses) 7,482 7,282
Income tax expense/(benefit), Gross Unrealized Gains (3,485) (3,776)
Income tax expense/(benefit), Gross Unrealized Losses 858 1,219
Income tax expense/(benefit), Net Unrealized Gains/(Losses) (2,627) (2,557)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains 6,440 6,978
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses (1,585) (2,253)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/(Losses) $ 4,855 $ 4,725