CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS [Abstract]
Net income	$ 74,695	$ 70,558	$ 157,295	$ 131,708
Available-for-sale debt securities:
Net unrealized holding (losses) gains on debt securities	(175,923)	28,496	(507,757)	(70,433)
Other comprehensive (loss) income for the period, net of tax	(175,923)	28,496	(507,757)	(70,433)
Total comprehensive (loss) income	$ (101,228)	$ 99,054	$ (350,462)	$ 61,275