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Note Guarantees (Credit recourse) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Guarantee on loans sold or serviced with credit recourse
Guarantor Obligations [Line Items]
Valuation Allowances And Reserves Balance	$ 57,747	$ 52,052	$ 57,747	$ 52,052	$ 57,425	$ 58,820	$ 49,395	$ 54,489
Serviced Mortgage Loans
Guarantor Obligations [Line Items]
Loans serviced	15,900,000		15,900,000			16,100,000
Loans with Recourse
Guarantor Obligations [Line Items]
Loans serviced	1,400,000		1,400,000			$ 1,500,000
Loans with Recourse | Serviced Mortgage Loans
Guarantor Obligations [Line Items]
Repurchased Loans	$ 4,000	$ 7,000	$ 13,000	$ 22,000

X

- Definition

Unpaid principal amount of loans repurchased under credit recourse provisions or representations, warranty arrangements and GNMA buy-back options.

+ References

No definition available.

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X

- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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