Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	$ 0	$ 0
Total assets	0	0
Fixed-rate debt	0	0
Total fixed-rate debt	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	0	0
Total assets	0	0
Fixed-rate debt	0	0
Total fixed-rate debt	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	1,182,910	1,155,464
Total assets	1,182,910	1,155,464
Fixed-rate debt	219,350	226,965
Total fixed-rate debt	219,350	226,965
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	1,055,125	1,029,117
Total assets	1,055,125	1,029,117
Fixed-rate debt	225,021	232,972
Total fixed-rate debt	225,021	232,972
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment, net	1,182,910	1,155,464
Total assets	1,182,910	1,155,464
Fixed-rate debt	219,350	226,965
Total fixed-rate debt	$ 219,350	$ 226,965