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Mortgage Loans on Real Estate Troubled Debt Restructures (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 loans | Dec. 31, 2012 loans
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Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 46,837 | $ 57,081
Financing Receivable, Modifications, Number of Contracts | 21 | 24
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 57,935 | 68,050
Financing Receivable, Allowance for Credit Losses | (11,098) | (10,969)
Troubled Debt Restructurings, East Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 2,783 | 2,783
Financing Receivable, Modifications, Number of Contracts | 1 | 1
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 4,208 | 4,208
Financing Receivable, Allowance for Credit Losses | (1,425) | (1,425)
Troubled Debt Restructurings, Mountain Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 24,361 | 27,084
Financing Receivable, Modifications, Number of Contracts | 9 | 10
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 25,533 | 28,786
Financing Receivable, Allowance for Credit Losses | (1,172) | (1,702)
Troubled Debt Restructurings, South Atlantic Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 11,389 | 18,311
Financing Receivable, Modifications, Number of Contracts | 7 | 9
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 17,287 | 23,358
Financing Receivable, Allowance for Credit Losses | (5,898) | (5,047)
Troubled Debt Restructurings, East North Central Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 1,752 | 1,765
Financing Receivable, Modifications, Number of Contracts | 1 | 1
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 2,219 | 2,232
Financing Receivable, Allowance for Credit Losses | (467) | (467)
Troubled Debt Restructurings, West North Central Region [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 6,552 | 7,138
Financing Receivable, Modifications, Number of Contracts | 3 | 3
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 8,688 | 9,466
Financing Receivable, Allowance for Credit Losses | $ (2,136) | $ (2,328)

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Amount of investment in financing receivables (before modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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