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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 2,483,782	$ 2,449,909
Percent	100.00%	100.00%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 399,139	$ 396,154
Percent	16.10%	16.20%
Medical Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 76,686	$ 77,438
Percent	3.10%	3.20%
Retail [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 773,741	$ 790,158
Percent	31.10%	32.20%
Industrial/Warehouse [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 698,385	$ 686,400
Percent	28.10%	28.00%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 3,308	$ 3,361
Percent	0.10%	0.10%
Apartment [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 362,222	$ 352,971
Percent	14.60%	14.40%
Mixed Use/Other [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 170,301	$ 143,427
Percent	6.90%	5.90%
East [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 697,469	$ 698,113
Percent	28.10%	28.50%
Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 158,337	$ 160,261
Percent	6.40%	6.60%
Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 243,453	$ 252,442
Percent	9.80%	10.30%
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 13,053	$ 13,161
Percent	0.50%	0.50%
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 382,616	$ 355,268
Percent	15.40%	14.50%
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 470,729	$ 456,227
Percent	18.90%	18.60%
West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 324,748	$ 313,120
Percent	13.10%	12.80%
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 193,377	$ 201,317
Percent	7.80%	8.20%

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=49124121&loc=d3e5066-111524

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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