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Mortgage Servicing (Details) - MSRs - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 17,794,681		$ 17,794,681		$ 16,206,315
Weighted average servicing fee (as a percent)			0.462%		0.477%
Interest earned on total escrows	3,700	$ 1,500	$ 8,600	$ 3,300
Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			100.00%		100.00%
Escrow Deposit	806,600		$ 806,600		$ 750,800
Fee-based servicing portfolio | Agency Business
Mortgage Servicing
Escrow Deposit	567,300		$ 567,300		$ 477,900
Texas | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			21.00%		22.00%
North Carolina | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			10.00%		10.00%
California | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			8.00%		8.00%
New York | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			8.00%		8.00%
Georgia | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			6.00%		6.00%
Florida | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			6.00%		6.00%
Other | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			41.00%		40.00%
Fannie Mae
Mortgage Servicing
Unpaid principal balance of loans serviced	13,195,643		$ 13,195,643		$ 12,502,699
Fannie Mae | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			74.00%		77.00%
Freddie Mac
Mortgage Servicing
Unpaid principal balance of loans serviced	3,977,619		$ 3,977,619		$ 3,166,134
Freddie Mac | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			22.00%		20.00%
FHA
Mortgage Servicing
Unpaid principal balance of loans serviced	$ 621,419		$ 621,419		$ 537,482
FHA | Fee-based servicing portfolio
Mortgage Servicing
UPB Percentage of Total			4.00%		3.00%

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- Definition

Percentage of servicing fee on loans.

+ References

No definition available.

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- Definition

Amount of interest income earned, net of interest paid to the borrower.

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The percentage of unpaid principal balance to total unpaid principal balance as of the balance sheet date.

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719

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