Fair Value - Fair Value Option Maturities, Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair value
Total fair value	$ 5,186,656	$ 3,509,300
Recurring basis
Fair value
Total fair value	5,186,656	3,509,300
Mortgage loans held for sale | Recurring basis
Fair value
Current through 89 days delinquent	5,142,606	3,450,578
Not in foreclosure	38,422	47,252
In foreclosure	5,628	11,470
Total fair value	5,186,656	3,509,300
Principal amount due upon maturity
Current through 89 days delinquent	5,118,234	3,428,052
Not in foreclosure	44,694	53,351
In foreclosure	18,938	16,811
Total principal amount due upon maturity	5,181,866	3,498,214
Difference
Current through 89 days delinquent	24,372	22,526
Not in foreclosure	(6,272)	(6,099)
In foreclosure	(13,310)	(5,341)
Total difference	$ 4,790	$ 11,086