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Mortgage Servicing (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) state	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) state
Fee-based servicing portfolio
Mortgage Servicing
Escrow Deposit	$ 1,530,000		$ 1,530,000		$ 1,290,000
MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	26,035,055		$ 26,035,055		$ 24,628,456
UPB Percentage of Total			100.00%
Weighted average servicing fee (as a percent)			0.459%		0.454%
Interest earned on total escrows	1,100	$ 1,400	$ 2,200	$ 4,500
MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			100.00%		100.00%
Number of states accounted for more than 4% of UPB and related servicing revenues | state			0		0
Escrow Deposit	810,200		$ 810,200		$ 867,600
Texas | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			15.00%		16.00%
New York | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			11.00%		9.00%
North Carolina | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			9.00%		9.00%
California | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			8.00%		9.00%
Florida | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			6.00%		7.00%
Georgia | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			6.00%		6.00%
New Jersey | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			5.00%		4.00%
Other | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			40.00%		40.00%
Fannie Mae
Mortgage Servicing
UPB Percentage of Total			74.00%
Fannie Mae | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	19,191,969		$ 19,191,969		$ 18,268,268
Fannie Mae | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total					74.00%
Freddie Mac
Mortgage Servicing
UPB Percentage of Total			18.00%
Freddie Mac | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	4,708,457		$ 4,708,457		$ 4,881,080
Freddie Mac | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total					20.00%
FHA
Mortgage Servicing
UPB Percentage of Total			3.00%
FHA | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	882,899		$ 882,899		$ 752,116
FHA | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total					3.00%
Private Label
Mortgage Servicing
UPB Percentage of Total			5.00%
Private Label | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	1,176,627		$ 1,176,627		$ 726,992
Private Label | MSRs | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total					3.00%
SFR - Fixed Rate
Mortgage Servicing
UPB Percentage of Total			1.00%
SFR - Fixed Rate | MSRs
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 75,103		$ 75,103

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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.

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 4
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