Warehouse Facilities Collateralized by U.S. Government Sponsored Enterprises (Details) - USD ($)	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Securities Financing Transaction
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises	$ 834,582,000	$ 1,050,693,000
Outstanding draws	834,582,000	1,050,693,000
Committed Lines
Securities Financing Transaction
Lines available	1,450,000,000
Uncommitted Lines
Securities Financing Transaction
Lines available	700,000,000
Warehouse facility due June 14,2023 Number 1
Securities Financing Transaction
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises	0	243,659,000
Outstanding draws	$ 0	243,659,000
Warehouse facility due June 14,2023 Number 1 | LIBOR
Securities Financing Transaction
Basis spread on variable rate	1.35%
Warehouse facility due June 14,2023 Number 1 | Committed Lines
Securities Financing Transaction
Lines available	$ 450,000,000
Warehouse facility due June 14,2023 Number 2
Securities Financing Transaction
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises	0	135,601,000
Outstanding draws	$ 0	135,601,000
Warehouse facility due June 14,2023 Number 2 | LIBOR
Securities Financing Transaction
Basis spread on variable rate	1.35%
Warehouse facility due June 14,2023 Number 2 | Uncommitted Lines
Securities Financing Transaction
Lines available	$ 300,000,000
Warehouse facility due October 7 2022
Securities Financing Transaction
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises	275,008,000	384,571,000
Outstanding draws	$ 275,008,000	384,571,000
Warehouse facility due October 7 2022 | LIBOR
Securities Financing Transaction
Basis spread on variable rate	1.30%
Warehouse facility due October 7 2022 | Committed Lines
Securities Financing Transaction
Lines available	$ 600,000,000
Warehouse facility due October 7 2022 | Committed Lines | SOFR
Securities Financing Transaction
Basis spread on variable rate	1.90%
Warehouse facility due October 7 2022 | Sublimit Lines
Securities Financing Transaction
Lines available	$ 125,000,000
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises	0
Outstanding draws	0
Warehouse facility due September 25, 2022
Securities Financing Transaction
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises	371,932,000	193,091,000
Outstanding draws	$ 371,932,000	193,091,000
Warehouse facility due September 25, 2022 | LIBOR
Securities Financing Transaction
Basis spread on variable rate	1.30%
Warehouse facility due September 25, 2022 | Committed Lines
Securities Financing Transaction
Lines available	$ 400,000,000
Fannie Mae repurchase agreement, open maturity
Securities Financing Transaction
Warehouse facilities collateralized by U.S. Government Sponsored Enterprises	187,642,000	93,771,000
Outstanding draws	$ 187,642,000	$ 93,771,000
Fannie Mae repurchase agreement, open maturity | LIBOR
Securities Financing Transaction
Basis spread on variable rate	1.15%
Fannie Mae repurchase agreement, open maturity | Uncommitted Lines
Securities Financing Transaction
Lines available	$ 400,000,000