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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 2,470,456	$ 2,457,721
Percent	100.00%	100.00%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 417,122	$ 484,585
Percent	16.90%	19.70%
Medical Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 84,843	$ 88,275
Percent	3.40%	3.60%
Retail [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 768,210	$ 711,775
Percent	31.10%	29.00%
Industrial/Warehouse [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 688,336	$ 649,425
Percent	27.90%	26.40%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 3,412	$ 30,640
Percent	0.10%	1.30%
Apartment [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 362,809	$ 335,087
Percent	14.70%	13.60%
Mixed Use/Other [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 145,724	$ 157,934
Percent	5.90%	6.40%
East [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 720,522	$ 701,638
Percent	29.20%	28.50%
Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 160,946	$ 166,249
Percent	6.50%	6.80%
Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 255,454	$ 279,075
Percent	10.30%	11.40%
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 13,267	$ 12,280
Percent	0.50%	0.50%
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 359,231	$ 302,307
Percent	14.60%	12.30%
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 451,123	$ 471,849
Percent	18.30%	19.20%
West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 311,774	$ 349,028
Percent	12.60%	14.20%
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 198,139	$ 175,295
Percent	8.00%	7.10%

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.

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- 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 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 2: 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 3: 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=35738203&loc=d3e5066-111524



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

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