Derivative Financial Instruments Schedule of interest rate swaps and caps (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Total Notional Amount	$ 10,405,957	$ 13,138,667
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Forward Contracts [Member] \| Matures July 2019 and August 2019 [Member]
Derivative [Line Items]
Number of Instruments	4
Total Notional Amount	100,000
Cash Flow Hedging [Member] \| Federal Home Loan Bank Advances [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Cap [Member] \| Matures December 2021 [Member]
Derivative [Line Items]
Number of Instruments	6
Total Notional Amount	$ 150,000
Index Rate	3.00%

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

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