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Securities - Unrealized Gains (Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 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 $ 3,514   $ 6,975 [1]
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Losses (8,628)   (3,968) [1]
Total unrealized gains/(losses) on debt securities available-for-sale, Net Unrealized (Losses)/Gains (5,114)   3,007 [1]
Income tax (expense) benefit, Gross Unrealized Gains (746)   (2,450)
Income tax (expense) benefit, Gross Unrealized Losses 1,832   1,394
Income tax (expense) benefit, Net Unrealized (Losses)/Gains 1,086   (1,056)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains 2,768   4,525
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses (6,796)   (2,574)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/(Losses) $ (4,028)   1,951
ASU No. 2016-01 | Retained Earnings      
Debt Securities, Available-for-sale [Line Items]      
Reclassification of net unrealized gains on equity securities   $ 900 862 [2]
ASU No. 2016-01 | AOCI Attributable to Parent      
Debt Securities, Available-for-sale [Line Items]      
Reclassification of net unrealized gains on equity securities   $ (900) $ (862) [2]
[1] Gross unrealized gains and losses of $0.9 million 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, related to changes in fair value for equity securities reclassified out of accumulated other comprehensive income