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Investments (Details 12) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	$ 2,385,149	$ 2,312,167
Percentage of total	100.00%	100.00%
Pacific
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	636,084	593,589
Percentage of total	26.70%	25.70%
South Atlantic
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	507,010	477,068
Percentage of total	21.30%	20.50%
Mountain
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	257,130	233,174
Percentage of total	10.80%	10.10%
Middle Atlantic
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	276,799	300,475
Percentage of total	11.60%	13.00%
West North Central
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	174,764	168,063
Percentage of total	7.30%	7.30%
East North Central
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	222,991	224,122
Percentage of total	9.20%	9.70%
West South Central
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	158,666	161,451
Percentage of total	6.70%	7.00%
East South Central
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	61,966	62,789
Percentage of total	2.60%	2.70%
New England
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]
Recorded investment	$ 89,739	$ 91,436
Percentage of total	3.80%	4.00%

X

- Definition

The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

No definition available.

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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=28368275&loc=d3e5066-111524



Reference 2: 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 3: 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 4: 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

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