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Advances Schedule of Changes in Allowance for Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Advances [Abstract]    
Beginning balance $ 16,465 $ 37,952
Provision 2,524 3,421
Net charge-offs and other (2,009) (5,529)
Ending balance $ 16,980 $ 35,844