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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) (Commercial Real Estate Portfolio Segment [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 2,625,563	$ 2,658,883
Percent	100.00%	100.00%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	613,050	666,467
Percent	23.40%	25.10%
Medical Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	131,304	136,764
Percent	5.00%	5.10%
Retail [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	698,189	677,951
Percent	26.60%	25.50%
Industrial/Warehouse [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	664,703	692,637
Percent	25.30%	26.10%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	79,385	94,045
Percent	3.00%	3.50%
Apartment [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	269,817	219,335
Percent	10.30%	8.20%
Mixed Use/Other [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	169,115	171,684
Percent	6.40%	6.50%
East [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	772,366	732,762
Percent	29.40%	27.50%
Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	149,951	155,094
Percent	5.70%	5.80%
Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	353,820	387,599
Percent	13.50%	14.60%
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	22,790	26,385
Percent	0.90%	1.00%
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	316,822	320,982
Percent	12.10%	12.10%
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	491,221	458,802
Percent	18.70%	17.30%
West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	358,115	370,168
Percent	13.60%	13.90%
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 160,478	$ 207,091
Percent	6.10%	7.80%

X

- Definition

Represents the specific geographic distribution or property type distribution amount as a percentabe of the total amortzed cost of mortgage loans.

+ References

No definition available.

+ Details

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X

- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 60

-Paragraph 47

-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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 51, 52, 53

-IssueDate 2006-05-01

-Chapter 8

-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.

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