Loans Held for Investment, Allowance for Loan Losses and Loans Held for Sale (Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unpaid principal balance	$ 543,790	$ 490,563
Net deferred origination costs	8,952	13,544
Total loans held for investment	552,742	504,107
Term loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unpaid principal balance	482,596	466,386
Lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total unpaid principal balance	$ 61,194	$ 24,177