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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Before-Tax |  |  |  |
Net change, other comprehensive income (loss) | $ 15,224 | $ (24,115) | $ 87,876 | $ (63,397)
Tax Effect |  |  |  |
Net change, other comprehensive income (loss) | (6,219) | 5,746 | (30,669) | 17,351
Net-of-Tax |  |  |  |
Other comprehensive income (loss) | 9,005 | (18,369) | 57,207 | (46,046)
Available- for-Sale Investment Securities |  |  |  |
Before-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | 16,900 | (19,319) | 92,369 | (56,238)
Net realized gains reclassified into net income | (58) | (35) | (3,066) | (2,374)
Net change, other comprehensive income (loss) | 16,842 | (19,354) | 89,303 | (58,612)
Tax Effect |  |  |  |
Net unrealized gains (losses) arising during the period | (4,996) | 5,735 | (27,308) | 16,650
Net realized gains reclassified into net income | 17 | 11 | 906 | 701
Net change, other comprehensive income (loss) | (4,979) | 5,746 | (26,402) | 17,351
Net-of-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | 11,904 | (13,584) | 65,061 | (39,588)
Net realized gains reclassified into net income | (41) | (24) | (2,160) | (1,673)
Other comprehensive income (loss) | 11,863 | (13,608) | 62,901 | (41,261)
Foreign Currency Translation Adjustments, Net of Hedges |  |  |  |
Before-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | (1,618) | (4,761) | (1,427) | (4,785)
Net change, other comprehensive income (loss) | (1,618) | (4,761) | (1,427) | (4,785)
Tax Effect |  |  |  |
Net unrealized gains (losses) arising during the period | (1,240) | 0 | (4,267) | 0
Net change, other comprehensive income (loss) | (1,240) | 0 | (4,267) | 0
Net-of-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | (2,858) | (4,761) | (5,694) | (4,785)
Net realized gains reclassified into net income | 0 | 0 | 0 | 0
Other comprehensive income (loss) | $ (2,858) | $ (4,761) | $ (5,694) | $ (4,785)

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