XML 49 R45.htm IDEA: XBRL DOCUMENT v3.19.3
Mortgage Loans on Real Estate (Impaired Mortgage Loans on Real Estate By Basis of Impairment) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Individually evaluated for impairment $ 1,235 $ 1,253
Collectively evaluated for impairment 3,219,917 2,951,211
Principal outstanding $ 3,221,152 $ 2,952,464