Income Tax (Components of Deferred Tax Asset) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets relating to:
Net operating loss carryforwards	$ 25,880	$ 19,183
Loan loss reserve	40,897	20,231
Imputed interest income	800	729
Deferred rent	2,670	1,613
Miscellaneous items	174	5
Total gross deferred tax assets	70,421	41,761
Deferred tax liabilities:
Internally developed software	2,224	1,756
Property, equipment and software	6,747	4,613
Origination costs	7,417	3,394
Miscellaneous items	430	20
Total gross deferred tax liabilities	16,818	9,783
Deferred assets less liabilities	53,603	31,978
Less: valuation allowance	(53,603)	(31,978)
Net deferred tax asset	$ 0	$ 0