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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 3,458,914	$ 2,952,464	$ 2,674,315
Percent	100.00%	100.00%
East
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 645,991	$ 586,773
Percent	18.70%	19.90%
Middle Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 284,597	$ 168,969
Percent	8.20%	5.70%
Mountain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 389,892	$ 357,642
Percent	11.30%	12.10%
New England
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 9,152	$ 9,418
Percent	0.30%	0.30%
Pacific
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 655,518	$ 521,363
Percent	19.00%	17.70%
South Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 751,199	$ 694,599
Percent	21.70%	23.50%
West North Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 302,534	$ 291,890
Percent	8.70%	9.90%
West South Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 420,031	$ 321,810
Percent	12.10%	10.90%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 250,287	$ 268,932
Percent	7.30%	9.10%
Medical Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 29,990	$ 33,467
Percent	0.90%	1.10%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 1,225,670	$ 1,091,627
Percent	35.40%	37.00%
Industrial/Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 896,558	$ 762,887
Percent	25.90%	25.80%
Apartment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 858,679	$ 600,638
Percent	24.80%	20.30%
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 51,303	$ 25,000
Percent	1.50%	0.90%
Mixed Use/Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 146,427	$ 169,913
Percent	4.20%	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.

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- Definition

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+ References

No definition available.

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- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

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