Commitments and Contingencies (Details)
$ in Thousands, BRL in Millions
12 Months Ended
Oct. 26, 2011
USD ($)
Dec. 31, 2016
USD ($)
Annuity_Policy
Dec. 31, 2016
BRL
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]          
Number of annuity policies | Annuity_Policy   2      
Rental expense   $ 200   $ 200 $ 100
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
2017   289      
2018 and thereafter   772      
Total   1,061      
Expected contribution in 2015   1,800      
Recovery of nonvested amounts in 2015   1,300      
Guaranty Association Assessments          
Loss Contingencies [Line Items]          
Guaranty association assessments   300   $ 300 $ 300
Brazilian Superintendence of Private Insurance          
Loss Contingencies [Line Items]          
SUSEP is attempting to impose peal fine $ 6,000,000 960 BRL 3    
New Loans          
Loss Contingencies [Line Items]          
Commitments to extend credit relating to mortgage loans   8,200      
Existing Loans          
Loss Contingencies [Line Items]          
Commitments to extend credit relating to mortgage loans   900      
Pending Litigation | Damaris Maldonado Vinas Et Al [Member]          
Loss Contingencies [Line Items]          
Guaranty association assessments   $ 2,900