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Mortgage Loans on Real Estate (Commercial Mortgage Loan Portfolio Summarized by Geographic Region and Property Type) (Details) - Commercial Mortgage Loans - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 3,535,506	$ 3,560,903
Percent	100.00%	100.00%
East
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 484,451	$ 502,659
Percent	13.70%	14.10%
Middle Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 278,727	$ 280,993
Percent	7.90%	7.90%
Mountain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 397,667	$ 416,307
Percent	11.20%	11.70%
New England
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 77,457	$ 73,631
Percent	2.20%	2.10%
Pacific
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 844,371	$ 858,812
Percent	23.90%	24.10%
South Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 943,302	$ 934,007
Percent	26.70%	26.20%
West North Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 197,206	$ 205,568
Percent	5.60%	5.80%
West South Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 312,325	$ 288,926
Percent	8.80%	8.10%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 366,086	$ 388,978
Percent	10.30%	10.90%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 845,217	$ 896,351
Percent	23.90%	25.20%
Industrial/Warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 896,797	$ 866,623
Percent	25.40%	24.30%
Apartment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 1,024,893	$ 912,984
Percent	29.00%	25.60%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 324,271	$ 285,271
Percent	9.20%	8.00%
Mixed Use/Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	$ 78,242	$ 210,696
Percent	2.20%	6.00%

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.

+ Details

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481598/310-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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