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Variable Interest Entities Text Tag (Details) (USD $) | Jun. 30, 2012 | Feb. 24, 2011 | Dec. 30, 2010 | May 15, 2009 | Apr. 28, 2006 | Jun. 30, 2012 Carver Statutory Trust 1 [Member] | Jun. 30, 2012 CDE 10 [Member] | Jun. 30, 2012 CDE 1-9, CDE 11-12 [Member] | Dec. 31, 2010 CDE 1-9, CDE 11-12 [Member] | Jun. 30, 2012 CDE 20 [Member] | Mar. 31, 2012 CDE 20 [Member]
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Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | $ 13,000,000 |  |  |  |  | $ 13,000,000 | $ 0 | $ 0 |  | $ 0 |
New Market Tax Credit Award |  | 25,000,000 |  | 65,000,000 | 59,000,000 |  |  |  |  |  |
Variable Interest Entity, Rights Transferred | 136,500,000 |  |  | 40,000,000 |  | 0 | 19,000,000 | 40,000,000 |  | 12,500,000 | 12,500,000
Cash |  |  | 6,700,000 |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 6,700,000 |  |
Variable Interest Entity, Funded Exposure, Equity Invesment | $ 407,000 |  |  |  |  | $ 400,000 | $ 0 | $ 0 |  | $ 1,000 |

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- Definition New Market Tax Credit Award + References No definition available. + Details
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- Definition Variable Interest Entity, Funded Exposure, Debt Investment + References No definition available. + Details
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- Definition Variable Interest Entity, Funded Exposure, Equity Invesment + References No definition available. + Details
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- Definition Variable Interest Entity, Rights Transferred + References No definition available. + Details
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- Definition Unrestricted cash available for day-to-day operating needs, for an entity that has cash equivalents, but does not aggregate cash equivalents with cash on the balance sheet. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 + Details
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- Definition Carrying amount of the equity interests owned by noncontrolling partners of a limited partnership included in the entity's consolidated financial statements. + References No definition available. + Details
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