Stockholders' Equity Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary impairments on AFS securities	$ 0	$ 0	$ 14,312
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other-than-temporary impairments on AFS securities	0	0	14,312
Realized gains on sales of certain AFS securities, net of tax	135,561	530,462	232,075
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	$ (135,561)	$ (530,462)	$ (217,763)