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Fair Value of Derivative and Other Financial Instruments - Investment in NDTs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Equity securities:
Net gains from equity securities sold	$ 5,698	$ 4,864
Net gains (losses) from equity securities still held	18,319	(10,523)
Total net gains (losses) on equity securities	24,017	(5,659)
Available-for-sale debt securities:
Net gains (losses) on debt securities	5,572	(11,517)
Net gains (losses) on investment securities	$ 29,589	$ (17,176)

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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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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