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Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Gains $ 1,960   $ 5,645 [1]
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Losses (15,573)   (3,967) [1]
Total unrealized gains/(losses) on debt securities available-for-sale, Net Unrealized (Losses)/Gains (13,613)   1,678 [1]
Income tax (expense) benefit, Gross Unrealized Gains (416)   (1,982)
Income tax (expense) benefit, Gross Unrealized Losses 3,307   1,393
Income tax (expense) benefit, Net Unrealized (Losses)/Gains 2,891   (589)
Net Unrealized (Losses)/Gains, Net of Tax Included in Accumulated Other Comprehensive Loss, Gross Unrealized Gains 1,544   3,663
Net Unrealized (Losses)/Gains, Net of Tax Included in Accumulated Other Comprehensive Loss, Gross Unrealized Losses (12,266)   (2,574)
Net Unrealized (Losses)/Gains, Net of Tax Included in Accumulated Other Comprehensive Loss, Net Unrealized (Losses)/Gains $ (10,722)   1,089
Retained Earnings | ASU No. 2016-01      
Debt Securities, Available-for-sale [Line Items]      
Reclassification of net unrealized gains on equity securities (from) AOCI to Retained Earnings   $ 900 862 [2]
AOCI | ASU No. 2016-01      
Debt Securities, Available-for-sale [Line Items]      
Reclassification of net unrealized gains on equity securities (from) AOCI to Retained Earnings   $ (900) $ (862) [2]
[1] Gross unrealized gains and losses of $862 at December 31, 2017 have been restated to reflect the reclassifications from OCI to retained earnings due to the adoption of ASU No. 2016-01
[2] Reclassification due to the adoption of ASU No. 2016-01.