Junior Subordinated Debt Securities Payable (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Short-term Debt [Line Items]
Net assets of Holdings' consolidated subsidiaries, subject to regulatory restrictions	2,108,692
Net assets of consolidated subsidiaries	2,766,266
Capital Trust II [Member]
Short-term Debt [Line Items]
Debt securities redeemed on or after, date	Mar. 30, 2009
Junior subordinated debt securities, maturity date	Mar. 29, 2034
Junior Subordinated Debt [Member]
Short-term Debt [Line Items]
Percentage of principal redeemable before maturity	100.00%
Debt securities redeemed on or after, date	Mar. 30, 2009
Debt securities, Trust may become subject to tax within number of days of redemption period	90

Debt Securities, Maturity Percentage in Date of Redemption

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- Definition

Debt Securities Redeemed On Or After Date

+ References

No definition available.

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- Definition

Minimum days for debt securities become subject to tax

+ References

No definition available.

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- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 4

-Section 08

-Paragraph e

-Subparagraph 3

Reference 2: 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.(e)(3)(ii))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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- Definition

Date of maturity of a debt security categorized as held-to-maturity.

+ References

No definition available.

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- Definition

The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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