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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 2,449,909	$ 2,457,721	$ 2,607,698
Percent	100.00%	100.00%
Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 396,154	$ 484,585
Percent	16.20%	19.70%
Medical Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 77,438	$ 88,275
Percent	3.20%	3.60%
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 790,158	$ 711,775
Percent	32.20%	29.00%
Industrial/Warehouse [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 686,400	$ 649,425
Percent	28.00%	26.40%
Hotel [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 3,361	$ 30,640
Percent	0.10%	1.30%
Apartment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 352,971	$ 335,087
Percent	14.40%	13.60%
Mixed Use/Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 143,427	$ 157,934
Percent	5.90%	6.40%
East [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 698,113	$ 701,638
Percent	28.50%	28.50%
Middle Atlantic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 160,261	$ 166,249
Percent	6.60%	6.80%
Mountain [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 252,442	$ 279,075
Percent	10.30%	11.40%
New England [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 13,161	$ 12,280
Percent	0.50%	0.50%
Pacific [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 355,268	$ 302,307
Percent	14.50%	12.30%
South Atlantic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 456,227	$ 471,849
Percent	18.60%	19.20%
West North Central [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 313,120	$ 349,028
Percent	12.80%	14.20%
West South Central [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 201,317	$ 175,295
Percent	8.20%	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=49124121&loc=d3e5066-111524

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