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Mortgage Loans on Real Estate (Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 2,801,880	$ 2,674,315
Percent	100.00%	100.00%
East [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 593,073	$ 548,067
Percent	21.20%	20.50%
Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 165,172	$ 163,485
Percent	5.90%	6.10%
Mountain [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 329,565	$ 308,486
Percent	11.80%	11.50%
New England [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 12,026	$ 12,265
Percent	0.40%	0.50%
Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 489,126	$ 466,030
Percent	17.50%	17.40%
South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 645,864	$ 609,736
Percent	23.00%	22.80%
West North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 315,264	$ 324,808
Percent	11.20%	12.20%
West South Central [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 251,790	$ 241,438
Percent	9.00%	9.00%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 275,078	$ 283,926
Percent	9.80%	10.60%
Medical Office [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 32,461	$ 34,338
Percent	1.20%	1.30%
Retail [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 1,047,901	$ 1,040,028
Percent	37.40%	38.90%
Industrial/Warehouse [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 720,769	$ 677,770
Percent	25.70%	25.30%
Apartment [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 544,328	$ 462,897
Percent	19.40%	17.30%
Mixed Use/Other [Member]
Mortgage Loans on Real Estate [Line Items]
Principal outstanding	$ 181,343	$ 175,356
Percent	6.50%	6.60%

X

- Definition

Represents the specific geographic distribution or property type distribution amount as a percentage of the total amortized 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=84173941&loc=d3e5066-111524

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+ References

No definition available.

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