Loan Sales and Servicing Activities - Summary of Cash Flows with Transferees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Cash flows:
Sales proceeds	$ 27,587,429	$ 19,676,917
Servicing fees received	396,232	336,248
Allowance for losses rollforward
Balance at beginning of quarter	85,788	73,991
Provision (reversal of provision) for losses	4,184	(1,541)
Charge-offs, net	(7,817)	(5,123)
Balance at end of quarter	82,155	$ 67,327
Period end information:
Unpaid principal balance of loans outstanding	426,951,027		$ 410,393,342
30-89 days	15,120,416		17,301,961
90 days or more - Not in foreclosure	6,878,669		8,104,348
90 days or more - In foreclosure	1,230,939		693,934
90 days or more - Foreclosed	3,262		2,928
Loans in bankruptcy	$ 1,815,360		$ 1,762,324