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Mortgage Loans on Real Estate (Rollforward of Valuation Allowance on Mortgage Loan Portfolios) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	$ (26,581)	$ (20,089)	$ (31,029)	$ (17,779)
Charge-offs	0	0	0	1,485
Recoveries	0	0	0	712
Change in provision for credit losses	5,023	810	9,471	(3,697)
Ending allowance balance	(21,558)	(19,279)	(21,558)	(19,279)
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(22,498)	(18,119)	(25,529)	(17,579)
Charge-offs	0	0	0	1,485
Recoveries	0	0	0	712
Change in provision for credit losses	4,808	990	7,839	(1,747)
Ending allowance balance	(17,690)	(17,129)	(17,690)	(17,129)
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(454)	(320)	(2,130)	(200)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Change in provision for credit losses	(174)	20	1,502	(100)
Ending allowance balance	(628)	(300)	(628)	(300)
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(3,629)	(1,650)	(3,370)	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Change in provision for credit losses	389	(200)	130	(1,850)
Ending allowance balance	$ (3,240)	$ (1,850)	$ (3,240)	$ (1,850)

X

- Definition

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

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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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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