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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2015
Jun. 30, 2015
Noncontrolling Interest [Line Items]          
Number of operating segments | segment 1        
Number of reportable segments | segment 1        
Lines of credit amortization period 6 months        
Threshold to consider a loan to be delinquent 1 day        
Delinquency threshold to make initial assessment of charge off 90 days        
Advertising costs $ 22,500 $ 14,400 $ 7,200    
Cumulative translation loss (372) 0      
Net loss resulting from foreign exchange transactions $ 1,300        
Stock options          
Noncontrolling Interest [Line Items]          
Additional monthly vesting period 3 years        
Expiration period 10 years        
Period after employee's termination 90 days        
Stock options | Tranche one          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
Vesting period 1 year        
Stock options | Tranche two          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
Stock options | Tranche three          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
Stock options | Tranche four          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs          
Noncontrolling Interest [Line Items]          
Vesting period 4 years        
RSUs | Tranche one          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs | Tranche two          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs | Tranche three          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
RSUs | Tranche four          
Noncontrolling Interest [Line Items]          
Vesting percentage 25.00%        
Reserve for Off-balance Sheet Activities          
Noncontrolling Interest [Line Items]          
Related accrual for unfunded loan commitments $ 4,200 1,300      
Undrawn lines of Credit          
Noncontrolling Interest [Line Items]          
Off-balance sheet credit exposure $ 89,100 $ 28,700      
On Deck Australia          
Noncontrolling Interest [Line Items]          
Ownership percentage         55.00%
Ownership percentage by non-affiliated parties         45.00%
Lancelot QBFOD LLC          
Noncontrolling Interest [Line Items]          
Ownership percentage       67.00%  
Ownership percentage by non-affiliated parties       33.00%