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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Before-Tax |  |  |  |
Net change, other comprehensive income (loss) | $ 40,095 | $ (19,374) | $ 72,652 | $ (39,282)
Tax Effect |  |  |  |
Net change, other comprehensive income (loss) | (17,084) | 3,711 | (24,450) | 11,605
Net-of-Tax |  |  |  |
Other comprehensive income (loss) | 23,011 | (15,663) | 48,202 | (27,677)
Available- for-Sale Investment Securities |  |  |  |
Before-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | 44,531 | (12,342) | 75,469 | (36,919)
Net realized gains reclassified into net income | (1,447) | (210) | (3,008) | (2,339)
Net change, other comprehensive income (loss) | 43,084 | (12,552) | 72,461 | (39,258)
Tax Effect |  |  |  |
Net unrealized gains (losses) arising during the period | (14,485) | 3,649 | (22,312) | 10,915
Net realized gains reclassified into net income | 428 | 62 | 889 | 690
Net change, other comprehensive income (loss) | (14,057) | 3,711 | (21,423) | 11,605
Net-of-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | 30,046 | (8,693) | 53,157 | (26,004)
Net realized gains reclassified into net income | (1,019) | (148) | (2,119) | (1,649)
Other comprehensive income (loss) | 29,027 | (8,841) | 51,038 | (27,653)
Foreign Currency Translation Adjustments |  |  |  |
Before-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | (2,989) | (6,822) | 191 | (24)
Net change, other comprehensive income (loss) | (2,989) | (6,822) | 191 | (24)
Tax Effect |  |  |  |
Net unrealized gains (losses) arising during the period | (3,027) | 0 | (3,027) | 0
Net change, other comprehensive income (loss) | (3,027) | 0 | (3,027) | 0
Net-of-Tax |  |  |  |
Net unrealized gains (losses) arising during the period | (6,016) | (6,822) | (2,836) | (24)
Net realized gains reclassified into net income | 0 | 0 | 0 | 0
Other comprehensive income (loss) | $ (6,016) | $ (6,822) | $ (2,836) | $ (24)

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