Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	$ 2,663	$ 2,896
Addition to (release of) allowance for credit losses		(233)
Cumulative effect of adoption of ASU 2016-13	3,157
Addition to (release of) allowance for expected losses	462
Total ending balance	6,282	2,663
Commercial Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	2,622	2,861
Addition to (release of) allowance for credit losses		(239)
Cumulative effect of adoption of ASU 2016-13	3,118
Addition to (release of) allowance for expected losses	363
Total ending balance	6,103	2,622
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	41	35
Addition to (release of) allowance for credit losses		6
Cumulative effect of adoption of ASU 2016-13	39
Addition to (release of) allowance for expected losses	99
Total ending balance	179	41
Other Collateralized Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	0	0
Addition to (release of) allowance for credit losses		0
Cumulative effect of adoption of ASU 2016-13	0
Addition to (release of) allowance for expected losses	0
Total ending balance	$ 0	$ 0

Cumulative effect of adoption of ASU 2016-13

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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-Publisher FASB
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-Publisher FASB
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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB
-Name Accounting Standards Codification
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