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Debt Securities - Summary of Continuous Unrealized Loss Positions (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Fair Value  
Unrealized Loss Position for Less than 12 months, Fair Value $ 63,589
Unrealized Loss Position for 12 months or More, Fair Value 228,206
Unrealized Loss  
Unrealized Loss Position for Less than 12 months (1,780)
Unrealized Loss Position for 12 months or More (35,683)
Estimate of Fair Value [Member] | Commercial Mortgage Backed Securities [Member]  
Fair Value  
Unrealized Loss Position for Less than 12 months, Fair Value 63,589
Unrealized Loss Position for 12 months or More, Fair Value 228,206
Unrealized Loss  
Unrealized Loss Position for Less than 12 months (1,780)
Unrealized Loss Position for 12 months or More $ (35,683)