Borrowings - Additional Information (Details)	12 Months Ended
Dec. 31, 2015 USD ($) Person Institution	Dec. 31, 2014 USD ($) Person
Banking And Thrift [Abstract]
Number of counterparties in repurchase agreements \| Person	25	25
Weighted average contractual maturity of the repurchase agreements outstanding	27 days	30 days
Fair value of assets pledged as collateral under repurchase agreements	$ 14,072,647,000	$ 16,575,106,000
Number of financial institutions \| Institution	3
Number of outstanding borrowings from counterparties \| Person	2
Warehouse lines of credit	$ 60,096,000
Warehouse lines of credit earliest maturity date	2016-03
Warehouse lines of credit last maturity date	2016-09
Fair value of securities pledged as collateral under lines of credit facilities	$ 67,685,000
Warehouse lines of credit, Maximum borrowing capacity	300,000,000
FHLB advances outstanding	$ 14,132,000
FHLB advances interest rate	0.40%
FHLB advances, maturity date	2016-01
Fair value of assets pledged as collateral under FHLB	$ 15,714,000
FHLB advances maximum borrowing capacity	1,000,000,000
Outstanding principal amount	$ 58,052,000
Collateralized borrowings weighted-average interest rate	2.75%
Scheduled distribution date	2045-10

Federal home loan bank advances due date.

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- Definition

Mortgage loan on real estate maturity date.

+ References

No definition available.

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- Definition

Number of financial institution.

+ References

No definition available.

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- Definition

Outstanding borrowings counterparty number.

+ References

No definition available.

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- Definition

Repurchase agreement counterparty number.

+ References

No definition available.

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- Definition

Warehouse agreement borrowings due date earliest.

+ References

No definition available.

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- Definition

Warehouse agreement borrowings due date last.

+ References

No definition available.

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- References

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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- Definition

Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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-Name Accounting Standards Codification
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-SubTopic 470
-Section 45
-Paragraph 1
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- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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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 210.9-03.13(3)(a))
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-Paragraph 1
-Subparagraph (SX 210.5-02.22 (b))
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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

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

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Balance Type:	credit
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- Definition

The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of the FHLB debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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- Definition

The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

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- Definition

The fair value, as of the date of each statement of financial position presented, of securities that are restricted as collateral under letter of credit agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

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- Definition

This is the principal amount outstanding for securitized loans only (across all types of loans).

+ 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)
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- Definition

Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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.(m)(1)(i)(B)(iii))
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- 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)
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Article 9

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