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Loans Receivable - Narrative (Details)
$ in Thousands, £ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loans receivable          
Interest income     $ 10,406 $ 56,237 $ 88,808
Four Seasons          
Loans receivable          
Proceeds from sale of loan receivables $ 35,000 £ 29.0      
Amortized cost on HTM security, before OTTI | £   138.5      
Proceeds from sale of HTM security 101,000 83.0      
Real Estate Secured          
Loans receivable          
Interest income     $ 5,000    
Discounted cash flows | Level 2 | Four Seasons          
Loans receivable          
Other-than-temporary impairment loss, before tax $ 51,000 £ 42.0