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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 19,050	$ 14,375	$ (18,449)	$ 33,425	$ (25,042)
Unrealized gain (loss) on available-for-sale securities:
Unrealized gain (loss) arising during the period	9,555	(2,561)	40,002	6,994	(2,246)
Reclassification adjustment for gain included in net income (loss)	0	0	(1,419)	0	(1,419)
Total change in unrealized gain (loss) on available-for-sale securities	9,555	(2,561)	38,583	6,994	(3,665)
Total other comprehensive income (loss)	9,555	(2,561)	38,583	6,994	(3,665)
Comprehensive income	$ 28,605	$ 11,814	$ 20,134	$ 40,419	$ (28,707)

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