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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	[1]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance	$ (24,024)	$ (31,029)	$ (17,779)
Mortgage loans, carrying value	5,687,998	4,165,489
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	3,633,131	3,580,154
Deferred fees and costs, net	(4,629)	(1,266)
Mortgage loans, amortized cost	3,628,502	3,578,888
Valuation allowance	(17,926)	(25,529)	(17,579)
Mortgage loans, carrying value	3,610,576	3,553,359
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	408,135	245,807
Deferred fees and costs, net	(1,136)	(634)
Mortgage loans, amortized cost	406,999	245,173
Valuation allowance	(519)	(2,130)	(200)
Mortgage loans, carrying value	406,480	243,043
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal outstanding	1,652,910	366,320
Deferred fees and costs, net	1,468	925
Unamortized discounts and premiums, net	22,143	5,212
Mortgage loans, amortized cost	1,676,521	372,457
Valuation allowance	(5,579)	(3,370)	$ 0
Mortgage loans, carrying value	$ 1,670,942	$ 369,087
[1] Upon adoption of authoritative guidance effective January 1, 2020, we updated our accounting policies and methodology for calculating the general loan loss allowance, resulting in an adjustment to our mortgage loan valuation allowance. See Note 1 - Significant Accounting Policies for further details.

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

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