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Guarantees (Changes in liabilty of estimated loss from credit recourse agreement) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Movement In Guaranteed Benefit Liability Gross [Roll Forward]      
Balance at beginning of the period $ 358 $ 710 $ 439
Net (charge-off/terminations) recoveries (12) (352) 271
Balance at the end of the period $ 346 $ 358 $ 710