Debt - Mortgage Warehouse Borrowings (Detail) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Amount Drawn	$ 198,564,000	$ 183,444,000
Facility Amount	265,000,000	245,000,000
Mortgage loans held for sale	233,184,000	201,733,000
Secured Debt [Member] \| Flagstar [Member]
Line of Credit Facility [Line Items]
Amount Drawn	37,093,000	63,210,000
Facility Amount	$ 55,000,000	$ 75,000,000
Expiration Date	30 days written notice	30 days written notice
Expiration Date	30 days	30 days
Collateral	Mortgage Loans	Mortgage Loans
Secured Debt [Member] \| Flagstar [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest rate, spread rate	2.50%	2.50%
Secured Debt [Member] \| Comerica [Member]
Line of Credit Facility [Line Items]
Amount Drawn	$ 57,875,000	$ 18,009,000
Facility Amount	$ 85,000,000	$ 50,000,000
Expiration Date	Nov. 16, 2017	Nov. 16, 2016
Collateral	Mortgage Loans	Mortgage Loans
Secured Debt [Member] \| Comerica [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest rate, spread rate	2.25%	2.75%
Secured Debt [Member] \| J.P. Morgan [Member]
Line of Credit Facility [Line Items]
Amount Drawn	$ 103,596,000	$ 102,225,000
Facility Amount	$ 125,000,000	$ 120,000,000
Expiration Date	Sep. 26, 2017	Sep. 29, 2016
Collateral	Mortgage Loans and Pledged Cash	Mortgage Loans and Pledged Cash
Secured Debt [Member] \| J.P. Morgan [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest rate, spread rate		2.375%
Secured Debt [Member] \| J.P. Morgan [Member] \| LIBOR [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Interest rate, spread rate	2.375%
Secured Debt [Member] \| J.P. Morgan [Member] \| LIBOR [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Interest rate, spread rate	2.50%

Debt Instrument, Expiration Period

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Discussion of whether the borrowings under the credit facility are secured or unsecured and, if secured, a description of collateral (for example, accounts receivable less than 120 days old, finished goods inventory).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

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- Definition

Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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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.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Article 9

+ Details

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- Details

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