Mortgage Servicing Rights - Unpaid Principal Loan Balance of Servicing Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Total	$ 5,385,895	$ 5,177,404
Federal National Mortgage Association
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Total	2,486,363	2,517,434
Federal Home Loan Mortgage Corporation
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Total	1,720,075	1,630,403
Government National Mortgage Association
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Total	1,071,769	916,455
Federal Home Loan Bank
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Total	106,410	111,699
Other
Financing Receivable, Unpaid Principal Balance Of Servicing Portfolio [Line Items]
Total	$ 1,278	$ 1,413