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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Before-Tax |  |
Net change | $ (19,908) | $ 7,254
Tax Effect |  |
Net change | 7,894 | (2,626)
Net-of-Tax |  |
Net unrealized (losses) gains arising during the period | (10,513) | 6,062
Net realized gains reclassified into net income | (1,501) | (1,434)
Other comprehensive (loss) income | (12,014) | 4,628
Available- for-Sale Investment Securities |  |
Before-Tax |  |
Net unrealized (losses) gains arising during the period | (24,577) | 8,721
Net realized gains reclassified into net income | (2,129) | (2,474)
Net change | (26,706) | 6,247
Tax Effect |  |
Net unrealized (losses) gains arising during the period | 7,266 | (3,666)
Net realized gains reclassified into net income | 628 | 1,040
Net change | 7,894 | (2,626)
Net-of-Tax |  |
Net unrealized (losses) gains arising during the period | (17,311) | 5,055
Net realized gains reclassified into net income | (1,501) | (1,434)
Other comprehensive (loss) income | (18,812) | 3,621
Foreign Currency Translation Adjustments |  |
Before-Tax |  |
Net unrealized (losses) gains arising during the period | 6,798 | 1,007
Net change | 6,798 | 1,007
Tax Effect |  |
Net unrealized (losses) gains arising during the period | 0 | 0
Net change | 0 | 0
Net-of-Tax |  |
Net unrealized (losses) gains arising during the period | 6,798 | 1,007
Net realized gains reclassified into net income | 0 | 0
Other comprehensive (loss) income | $ 6,798 | $ 1,007

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