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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Before - Tax |  |  |
Other comprehensive income (loss) | $ 61,909 | $ (18,015) | $ 9,084
Tax Effect |  |  |
Other comprehensive income (loss) | (22,143) | 3,631 | 1,543
Net-of- Tax |  |  |
Net unrealized gains (losses) arising during the period | 42,534 | (12,598) | 15,284
Net realized gains reclassified into net income | (2,768) | (1,786) | (4,657)
Other comprehensive income (loss) | 39,766 | (14,384) | 10,627
Available- for-Sale Debt Investment Securities |  |  |
Before - Tax |  |  |
Net unrealized gains (losses) arising during the period | 65,549 | (9,748) | 4,368
Net realized gains reclassified into net income | (3,930) | (2,535) | (8,037)
Other comprehensive income (loss) | 61,619 | (12,283) | (3,669)
Tax Effect |  |  |
Net unrealized gains (losses) arising during the period | (19,379) | 2,882 | (1,837)
Net realized gains reclassified into net income | 1,162 | 749 | 3,380
Other comprehensive income (loss) | (18,217) | 3,631 | 1,543
Net-of- Tax |  |  |
Net unrealized gains (losses) arising during the period | 46,170 | (6,866) | 2,531
Net realized gains reclassified into net income | (2,768) | (1,786) | (4,657)
Other comprehensive income (loss) | 43,402 | (8,652) | (2,126)
Foreign Currency Translation Adjustments |  |  |
Before - Tax |  |  |
Net unrealized gains (losses) arising during the period | 290 | (5,732) | 12,753
Other comprehensive income (loss) | 290 | (5,732) | 12,753
Tax Effect |  |  |
Net unrealized gains (losses) arising during the period | (3,926) | 0 | 0
Other comprehensive income (loss) | (3,926) | 0 | 0
Net-of- Tax |  |  |
Net unrealized gains (losses) arising during the period | (3,636) | (5,732) | 12,753
Net realized gains reclassified into net income | 0 | 0 | 0
Other comprehensive income (loss) | $ (3,636) | $ (5,732) | $ 12,753

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