Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Before - Tax
Other comprehensive (loss) income	$ (18,015)	$ 9,084	$ (49,620)
Tax Effect
Other comprehensive (loss) income	3,631	1,543	16,415
Net-of- Tax
Other comprehensive (loss) income	(14,384)	10,627	(33,205)
Available- for-Sale Debt Investment Securities
Before - Tax
Net unrealized (losses) gains arising during the period	(9,748)
Net realized gains reclassified into net income	(2,535)
Other comprehensive (loss) income	(12,283)
Tax Effect
Net unrealized gains (losses) arising during the period	2,882
Net realized gains reclassified into net income	749
Other comprehensive (loss) income	3,631
Net-of- Tax
Net unrealized gains (losses) arising during the period	(6,866)
Net realized gains reclassified into net income	(1,786)
Other comprehensive (loss) income	(8,652)
Available- for-Sale Debt and Equity Investment Securities
Before - Tax
Net unrealized (losses) gains arising during the period		4,368	(28,681)
Net realized gains reclassified into net income		(8,037)	(10,362)
Other comprehensive (loss) income		(3,669)	(39,043)
Tax Effect
Net unrealized gains (losses) arising during the period		(1,837)	12,058
Net realized gains reclassified into net income		3,380	4,357
Other comprehensive (loss) income		1,543	16,415
Net-of- Tax
Net unrealized gains (losses) arising during the period		2,531	(16,623)
Net realized gains reclassified into net income		(4,657)	(6,005)
Other comprehensive (loss) income		(2,126)	(22,628)
Foreign Currency Translation Adjustments
Before - Tax
Net unrealized (losses) gains arising during the period	(5,732)	12,753	(10,577)
Other comprehensive (loss) income	(5,732)	12,753	(10,577)
Tax Effect
Net unrealized gains (losses) arising during the period	0	0	0
Other comprehensive (loss) income	0	0	0
Net-of- Tax
Net unrealized gains (losses) arising during the period	(5,732)	12,753	(10,577)
Net realized gains reclassified into net income	0	0	0
Other comprehensive (loss) income	$ (5,732)	$ 12,753	$ (10,577)