Fair Value - Fair Value Option Maturities, Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair value
Total fair value	$ 9,742,483	$ 11,616,400
Recurring basis
Fair value
Total fair value	9,742,483	11,616,400
Mortgage loans held for sale
Fair value
Current through 89 days delinquent	9,577,398	11,304,308
Not in foreclosure	153,162	275,419
In foreclosure	11,923	36,673
Total fair value	9,742,483	11,616,400
Principal amount due upon maturity
Current through 89 days delinquent	9,263,242	10,743,814
Not in foreclosure	153,875	280,595
In foreclosure	13,649	39,529
Total principal amount due upon maturity	9,430,766	11,063,938
Difference
Current through 89 days delinquent	314,156	560,494
Not in foreclosure	(713)	(5,176)
In foreclosure	(1,726)	(2,856)
Total difference	$ 311,717	$ 552,462