Schedule III - Real Estate and Accumulated Depreciation Schedule III - Reconciliation of Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Real Estate
Balance at the beginning of the period	$ 917,835	$ 819,591	$ 649,820
Reclassification of intangibles to accumulated amortization	1,316
Improvements and additions	75,345	232,582	267,367
Acquisitions through foreclosures	0	6,706	0
Dispositions	(50,150)	(141,044)	(97,596)
Impairments	0	0	0
Balance at the end of the period	944,346	917,835	819,591
Commercial Real Estate
Reconciliation of Real Estate
Balance at the beginning of the period	842,140	697,965	474,465
Reclassification of intangibles to accumulated amortization	1,316
Improvements and additions	72,963	230,915	267,367
Acquisitions through foreclosures	0	6,706	0
Dispositions	(14,622)	(93,446)	(43,867)
Impairments	0	0	0
Balance at the end of the period	901,797	842,140	697,965
Residential Real Estate
Reconciliation of Real Estate
Balance at the beginning of the period	75,695	121,626	175,355
Reclassification of intangibles to accumulated amortization	0
Improvements and additions	2,382	1,667	0
Acquisitions through foreclosures	0	0	0
Dispositions	(35,528)	(47,598)	(53,729)
Impairments	0	0	0
Balance at the end of the period	$ 42,549	$ 75,695	$ 121,626