CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 15,529	$ 22,704	$ 34,471	$ (181,949)
Other comprehensive (loss) income	(27,403)	65,030	(33,978)	45,353
Amounts related to available for sale securities:
Change in net unrealized gain or loss	(21,881)	64,659	(43,364)	(1,111)
Reclassification adjustment for amounts included in net income (loss)				66,864
Amounts related to cash flow hedges:
Change in net unrealized gain or loss	(7,088)	(567)	6,204	(21,818)
Reclassification adjustment for amounts included in net income (loss)	1,566	938	3,182	1,418
Other comprehensive income	(27,403)	65,030	(33,978)	45,353
Comprehensive (loss) income	$ (11,874)	$ 87,734	$ 493	$ (136,596)