SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE - Mortgage Loan Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Mortgage Loans on Real Estate
Balance at the beginning of the period	$ 81,056	$ 75,740	$ 103,440
Additions during period
New loans	74,234	76,316	105,201
Other - deferral for collection of commitment fees, net of costs	1,587	1,706
Other - recoveries of bad debts, net of bad debt expense			199
Other - accretion of loan fees and discounts	1,026	676	1,592
Deductions during period:
Collections of principal	(16,468)	(17,557)	(37,336)
Foreclosures		(127)	(92)
Cost of mortgages sold, net	(57,947)	(54,973)	(41,040)
Other - collection of commitment fees, net of costs			(739)
Other - bad debt expense	(240)	(191)
Other - reclassification from secured borrowings		(534)	(2,663)
Other - sale of commercial real estate loans (Note 7)			(52,822)
Balance at end of the period	$ 83,248	81,056	$ 75,740
Mortgage loans on real estate, non cash additions to commercial real estate loans		$ 966