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Mortgage Servicing (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) state	Dec. 31, 2022 USD ($) state
Mortgage Servicing
Escrow Deposit	$ 1,300,000	$ 1,500,000
Fee-based servicing portfolio
Mortgage Servicing
Escrow Deposit	1,500,000	1,700,000
MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 28,912,625	$ 27,998,029
Weighted average servicing fee (as a percent)	0.403%	0.411%
MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	100.00%	100.00%
Texas | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	12.00%	11.00%
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%	8.00%
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%	5.00%
New Jersey | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	5.00%	5.00%
Illinois | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	4.00%	4.00%
Other | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	41.00%	42.00%
Number of states accounted for more than 4% of UPB and related servicing revenues | state	0	0
Fannie Mae | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 19,508,256	$ 19,038,124
Fannie Mae | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	67.00%	68.00%
Fannie Mac | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 5,180,607	$ 5,153,207
Fannie Mac | 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	$ 2,233,500	$ 2,074,859
Private Label | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	8.00%	8.00%
FHA | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 1,242,669	$ 1,155,893
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	$ 467,881	$ 301,182
Bridge | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	2.00%	1.00%
SFR - Fixed Rate | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 279,712	$ 274,764
SFR - Fixed Rate | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total	1.00%	1.00%

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Percentage of servicing fee on loans.

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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
-Subparagraph (SX 210.9-03.10)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-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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