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Guarantees (Changes in liabilty of estimated loss from credit recourse agreement) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement In Guaranteed Benefit Liability Gross Roll Forward      
Balance at beginning of the period $ 927 $ 1,955 $ 2,460
Net charge-off/terminations (488) (1,028) (505)
Balance at the end of the period $ 439 $ 927 $ 1,955