Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-Publisher FASB
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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Investment Securities At Fair Value (Components of Investment Securities At Fair Value) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Cost					$ 140,705
Gross Unrealized Gains					11,193
Gross Unrealized Losses					(1,409)
Fair Value	$ 135,246		$ 135,246		150,489
Net loss recognized on equity securities	(797)	$ 0	(306)	$ 0
Less: Net losses recognized on equity securities sold	(717)		(534)
Net unrealized (losses) gains recognized on equity securities still held at the reporting date	(80)		228
Marketable equity securities
Debt Securities, Available-for-sale [Line Items]
Cost					35,020
Gross Unrealized Gains					10,994
Gross Unrealized Losses					(1,380)
Fair Value					44,634
Mutual funds invested in fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Cost					20,977
Gross Unrealized Gains					93
Gross Unrealized Losses					(29)
Fair Value					21,041
Marketable debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	84,250		84,250
Gross Unrealized Gains	2		2
Gross Unrealized Losses	0		0
Fair Value	84,252		84,252
Total debt securities available for sale
Debt Securities, Available-for-sale [Line Items]
Cost	84,250		84,250		84,708
Gross Unrealized Gains	2		2		106
Gross Unrealized Losses	0		0		0
Fair Value	$ 84,252		$ 84,252		$ 84,814