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Loans and Investments, Charge-offs and Recoveries Narratives (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loans and Investments
Net carrying value of loans sold		$ 34,800		$ 34,800
Proceeds from previously written-off loans and investments	$ 1,400		$ 2,300
Number of loans for which no provision for loan loss made | loan	0	0	0	0
Charge-offs			$ 3,173
Provision for loan losses	$ 2,218	$ 2,000	3,868	$ 2,000
Cumulative allowances for loan losses	60,951	$ 83,256	60,951	83,256	$ 58,733	$ 62,783	$ 81,256	$ 83,712
Recoveries of reserves			$ 2,527	$ 2,456
Ratio of net recoveries (in percentage)		0.10%	0.10%	0.10%
Mezzanine loans
Loans and Investments
Proceeds from Sale and Collection of Mortgage Notes Receivable				$ 1,800
Recoveries of reserves				1,800
Bridge loans
Loans and Investments
Provision for loan losses	1,700		$ 1,700
Recoveries of reserves				$ 700
Six loans collateralized by a land development project | Maturity date of September 2018
Loans and Investments
Unpaid principal balance on loans	121,400		121,400
Provision for loan losses	$ 500		$ 2,200
Number of loans with unpaid principal balance | loan	6		6
Five loans collateralized by a land development project | Maturity date of September 2018
Loans and Investments
Unpaid principal balance on loans	$ 112,000		$ 112,000
Weighted average accrual rate of interest (as a percent)			8.97%
Cumulative allowances for loan losses	$ 51,200		$ 51,200			$ 49,100
Number of loans with unpaid principal balance | loan	5		5
Hotel
Loans and Investments
Proceed from payment for full satisfaction of a preferred equity investment			$ 31,600
Net carrying value of loans sold			29,100
Charge-offs			3,200
Unpaid principal balance on loans	$ 34,800		34,800
Recoveries of reserves			$ 2,500

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