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Mortgage Loans on Real Estate (Rollforward of Valuation Allowance on Mortgage Loan Portfolios) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	$ (31,029)
Charge-offs	0
Recoveries	0
Change in provision for credit losses	2,515
Ending allowance balance	(28,514)
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(25,529)
Charge-offs	0
Recoveries	0
Change in provision for credit losses	(610)
Ending allowance balance	(26,139)
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(2,130)
Charge-offs	0
Recoveries	0
Change in provision for credit losses	1,691
Ending allowance balance	(439)
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(3,370)
Charge-offs	0
Recoveries	0
Change in provision for credit losses	1,434
Ending allowance balance	$ (1,936)

X

- 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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X

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

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X

- 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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X

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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