Borrowings - Additional Information (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2015 USD ($) Person Institution	Dec. 31, 2014 USD ($) Person
Banking And Thrift [Abstract]
Number of counterparties in repurchase agreements \| Person	26	25
Weighted average contractual maturity of the repurchase agreements outstanding	27 days	1 month
Fair value of assets pledged as collateral under repurchase agreements	$ 14,936,324	$ 16,575,106
FHLB advances outstanding	$ 14,132
FHLB advances interest rate	0.20%
FHLB advances, maturity date	2015-10
Fair value of assets pledged as collateral under FHLB	$ 15,714
FHLB advances maximum borrowing capacity	$ 1,000,000
Number of financial institutions \| Institution	3
Warehouse lines of credit	$ 33,172
Warehouse lines of credit earliest maturity date	2015-11
Warehouse lines of credit last maturity date	2016-03
Fair value of securities pledged as collateral under lines of credit facilities	$ 37,407,000
Warehouse lines of credit, Maximum borrowing capacity	$ 300,000

Federal home loan bank advances due date.

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- Definition

Number of financial institution.

+ 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.

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- 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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- 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)

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.13(3)(a))

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-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.

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-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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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.

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-Publisher FASB

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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.

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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.

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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

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-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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Article 9

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