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Commitments and Contingencies SBA Recourse Reserve Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Beginning balance			$ 1,750	$ 0	$ 0
SBA Recourse Provision	$ 1,315	$ 375	2,095	$ 449	2,068
SBA Loan Charge Offs, Net			(1,141)		(318)
Ending balance	$ 2,704		$ 2,704		$ 1,750