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Commitments and Contingencies SBA Recourse Reserve Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Beginning balance $ 2,849 $ 1,750
SBA Recourse Provision (295) 6
SBA Loan Charge Offs, Net (38) (91)
Ending balance $ 2,516 $ 1,665