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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 14,375	$ 21,703	$ (6,593)
Unrealized (loss) gain on available-for-sale securities:
Unrealized (loss) gain arising during the period	(2,561)	6,480	(42,248)
Total change in unrealized (loss) gain on available-for-sale securities	(2,561)	6,480	(42,248)
Total other comprehensive (loss) income	(2,561)	6,480	(42,248)
Comprehensive income (loss)	$ 11,814	$ 28,183	$ (48,841)

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