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Guarantees (Changes in Liabilty of Estimated Loss from Credit Recourse Agreement) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Movement In Guaranteed Benefit Liability Gross [Roll Forward]    
Balance at beginning of period $ 218 $ 985
Net (charge-off/terminations) recoveries (23) (79)
Balance at the end of period $ 195 $ 906