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Variable Interest Entities (Summary of the Impact of Qualifying LIHTC Investments) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Low income housing tax credits [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Amortization of qualifying LIHTC investments | $ 2,293,000 | $ 2,470,000 | $ 6,653,000 | $ 7,410,000
Affordable Housing Tax Credits and Other Tax Benefits | (2,363,000) | (2,462,000) | (7,089,000) | (7,387,000)
Other tax benefits related to qualifying LIHTC investments [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Affordable Housing Tax Credits and Other Tax Benefits | $ (819,000) | $ (1,859,000) | $ (2,418,000) | $ (5,578,000)

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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49127445&loc=SL49122993-202985 + Details
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- Definition Amount of amortization expense of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=49127445&loc=SL49122993-202985 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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