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Mortgage Servicing (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) state	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Mortgage Servicing
Interest earned on total escrows	$ 24,400,000	$ 4,200,000	$ 7,100,000
Fee-based servicing portfolio
Mortgage Servicing
Escrow Deposit	1,250,000,000	1,400,000,000
MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 27,998,029,000	$ 26,959,389,000
Weighted average servicing fee (as a percent)	41.10%	44.90%
MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	100.00%	100.00%
Escrow Deposit	$ 677,400,000	$ 682,500,000
Texas | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	11.00%	12.00%
New York | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	11.00%	11.00%
California | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	8.00%	8.00%
North Carolina | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	8.00%	9.00%
Georgia | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	6.00%	6.00%
Florida | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	5.00%	6.00%
New Jersey | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	5.00%	6.00%
Illinois | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	4.00%
Other States | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	42.00%	42.00%
Number of states accounted for more than 4% of UPB and related servicing revenues | state	0
Fannie Mae | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 19,038,124,000	$ 19,127,397,000
Fannie Mae | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	68.00%	71.00%
Federal Home Loan Mortgage Corporation Loans | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 5,153,207,000	$ 4,943,905,000
Federal Home Loan Mortgage Corporation Loans | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	18.00%	18.00%
Private Label | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 2,074,859,000	$ 1,711,326,000
Private Label | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	8.00%	6.00%
FHA | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 1,155,893,000	$ 985,063,000
FHA | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	4.00%	4.00%
Bridge | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 301,182,000
Bridge | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	1.00%
SFR - Fixed Rate | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 274,764,000	$ 191,698,000
SFR - Fixed Rate | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	1.00%	1.00%

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 954
-SubTopic 440
-Section 50
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 20
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-Paragraph 4
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