Subsequent Events (Details) - USD ($) $ in Thousands	Feb. 19, 2020	Feb. 18, 2020	Jan. 24, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Total loan commitments				$ 260,167	$ 154,802
Principal balance				$ 242,899	$ 137,129	$ 0
Weighted average coupon rate				5.76%	6.14%
Weighted average all in yield				6.41%	6.82%
Weighted average LTV				0.70	0.70
LIBOR | Subsequent Event
Subsequent Event [Line Items]
Total loan commitments	$ 36,820
Principal balance	$ 26,126
Weighted average coupon rate	3.62%
Weighted average all in yield	4.79%
Weighted-average LTV percentage	51.00%
Allentown, PA | LIBOR | Subsequent Event
Subsequent Event [Line Items]
Total loan commitments			$ 14,000
Principal balance			$ 14,000
Coupon rate, percent			3.50%
All-in yield, percentage			4.02%
Weighted average LTV			0.67
Dublin, OH | LIBOR | Subsequent Event
Subsequent Event [Line Items]
Total loan commitments		$ 22,820
Principal balance		$ 12,126
Coupon rate, percent		3.75%
All-in yield, percentage		5.67%
Weighted average LTV		0.33