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Variable Interest Entities (Details Textual) (USD $)
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6 Months Ended | |
|---|---|---|
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Jun. 30, 2012
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Dec. 31, 2011
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| Variable interest entities (Textual) [Abstract] | ||
| Mortgage loans, carrying value | $ 582,017,000 | $ 604,772,000 |
| Variable Interest Entities (Additional Textual) [Abstract] | ||
| Maximum exposure to loss, required compliance period, years | 15 years | |
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Real Estate Joint Ventures [Member]
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| Variable interest entities (Textual) [Abstract] | ||
| Number of ventures invested by company | 8 | 11 |
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Affordable Housing Real Estate Joint Ventures [Member]
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| Variable interest entities (Textual) [Abstract] | ||
| Number of ventures invested by company | 28 | 28 |
| Losses realizable if tax credits received were recaptured | 11,200,000 | 13,200,000 |
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Fixed-Rate Senior Mortgage Loan Commitments [Member]
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| Variable interest entities (Textual) [Abstract] | ||
| Mortgage loans, carrying value | $ 1,400,000 | $ 6,400,000 |