Loans Held for Investment - by Region (Details)	Dec. 31, 2015	Dec. 31, 2014
Loans held for investment by Region [Line Items]
Percentage of Loans concentrated in major states	39.80%	38.80%
California
Loans held for investment by Region [Line Items]
Percentage of Loans held in state	10.10%	10.10%
New York
Loans held for investment by Region [Line Items]
Percentage of Loans held in state	9.60%	9.50%
Pennsylvania
Loans held for investment by Region [Line Items]
Percentage of Loans held in state	8.10%	7.70%
New Jersey
Loans held for investment by Region [Line Items]
Percentage of Loans held in state	6.70%	6.30%
Illinois
Loans held for investment by Region [Line Items]
Percentage of Loans held in state	5.30%	5.20%