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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans, past due	$ 0	$ 0
Commercial mortgage loans, current	3,458,914	2,952,464
Commercial mortgage loans, collateral dependent receivables	0	0
Principal outstanding	3,458,914	2,952,464	$ 2,674,315
30 to 59 Days
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans, past due	0	0
60 to 89 Days
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans, past due	0	0
90 Days and Over
Financing Receivable, Past Due [Line Items]
Commercial mortgage loans, past due	$ 0	$ 0

X

- Definition

Mortgage loans on real estate at the reporting date that are not performing and will probably be satisfied by taking ownership of the real estate serving as collateral.

+ References

No definition available.

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- Definition

Amount of financing receivable not past due.

+ References

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- Definition

Amount of financing receivable past due.

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- Definition

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

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