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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Preferred shares, par value $ 1.00 $ 1.00  
Common shares, par value $ 0.01 $ 0.01  
Off-Balance Sheet, Credit Loss, Liability $ 50,776 $ 47,776 $ 21,907