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Fair Value Measurements (Changes in the Fair Value of Loans Receivable) (Details) - Loans Receivable - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 47,743 $ 59,251
Credit losses 0 (13,369)
Interest accrual 3,714 2,461
Paydowns (1,275) (600)
Ending balance $ 50,182 $ 47,743