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Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Derivative [Line Items]
Derivative, Fair Value, Net	$ 16,114
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	755,900
Derivative, Fair Value, Net	21,668
Weighted Average Pay Rate	1.71%
Weighted Average Receive Rate	0.26%
Weighted Average Years to Maturity	8 years 289 days
Year 2016 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	38,000
Derivative, Fair Value, Net	(204)
Weighted Average Pay Rate	0.89%
Weighted Average Receive Rate	0.26%
Weighted Average Years to Maturity	2 years 322 days
Year 2017 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	109,000
Derivative, Fair Value, Net	(696)
Weighted Average Pay Rate	1.20%
Weighted Average Receive Rate	0.26%
Weighted Average Years to Maturity	3 years 300 days
Year 2018 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	90,000
Derivative, Fair Value, Net	1,773
Weighted Average Pay Rate	0.88%
Weighted Average Receive Rate	0.27%
Weighted Average Years to Maturity	4 years 219 days
Year 2020 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	235,900
Derivative, Fair Value, Net	6,054
Weighted Average Pay Rate	1.57%
Weighted Average Receive Rate	0.26%
Weighted Average Years to Maturity	6 years 238 days
Year 2023 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	213,000
Derivative, Fair Value, Net	9,279
Weighted Average Pay Rate	2.14%
Weighted Average Receive Rate	0.26%
Weighted Average Years to Maturity	9 years 238 days
Year 2043 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative notional	70,000
Derivative, Fair Value, Net	$ 5,462
Weighted Average Pay Rate	3.20%
Weighted Average Receive Rate	0.26%
Weighted Average Years to Maturity	29 years 249 days

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- Definition

Derivative notional amount.

+ References

No definition available.

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X

- Definition

Weighted average pay rate on interest rate swaps.

+ References

No definition available.

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X

- Definition

Weighted average receive rate on interest rate swaps.

+ References

No definition available.

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X

- Definition

Weighted Average Years to Maturity

+ References

No definition available.

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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