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Fair Value of Derivative and Other Financial Instruments - Investments in NDT and Gross Realized Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity securities:
Net gains (losses) from equity securities sold	$ 9,871	$ (844)
Net gains (losses) from equity securities still held	(1,205)	7,477
Total net gains on equity securities	8,666	6,633
Available-for-sale debt securities:
Net gains (losses) on debt securities	9,332	(191)
Net gains on investment securities	$ 17,998	$ 6,442

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

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