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Guarantees (Changes in Liabilty of Estimated Loss from Credit Recourse Agreement) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Movement In Guaranteed Benefit Liability Gross [Roll Forward]        
Balance at beginning of period $ 894 $ 225 $ 985 $ 346
Net (charge-off/terminations) recoveries (18) 20 (109) (101)
Balance at the end of period $ 876 $ 245 $ 876 $ 245