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Loans Receivable - Summary of Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of loan impairments      
Balance of deteriorated loans at end of year $ 178,369 $ 242,319 $ 188,018
Allowance for credit losses (148,438) (212,514) (68,372)
Balance of deteriorated loans not reserved 29,931 29,805 119,646
Interest recognized on impaired loans 3,185 18,937 16,235
Financing receivable, nonaccrual $ 2,157 $ 3,623 $ 2,534