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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, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 3,059,265	$ 2,952,464
Percent	100.00%	100.00%
East
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 578,066	$ 586,773
Percent	18.90%	19.90%
Middle Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 197,754	$ 168,969
Percent	6.50%	5.70%
Mountain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 366,235	$ 357,642
Percent	12.00%	12.10%
New England
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 9,352	$ 9,418
Percent	0.30%	0.30%
Pacific
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 549,935	$ 521,363
Percent	18.00%	17.70%
South Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 713,449	$ 694,599
Percent	23.30%	23.50%
West North Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 292,494	$ 291,890
Percent	9.50%	9.90%
West South Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 351,980	$ 321,810
Percent	11.50%	10.90%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 262,455	$ 268,932
Percent	8.60%	9.10%
Medical Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 33,005	$ 33,467
Percent	1.10%	1.10%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 1,135,366	$ 1,091,627
Percent	37.10%	37.00%
Industrial/Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 813,667	$ 762,887
Percent	26.60%	25.80%
Apartment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 610,399	$ 600,638
Percent	19.90%	20.30%
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 32,274	$ 25,000
Percent	1.10%	0.90%
Mixed Use/Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 172,099	$ 169,913
Percent	5.60%	5.80%

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.

+ Details

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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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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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