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Fair Value of Financial Instruments - Rollforward of Level 3 Assets Measured on Recurring Basis (Details) - Fair Value, Recurring Measurements [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Level 3 assets, beginning of period $ 567 $ 8,162
Net unrealized gains (losses) included in other comprehensive income (8) 232
Realized gains (losses) and accretion (amortization) recognized in earnings, including OTTI 38 26
Purchases 500  
Settlements (169) (958)
Transfers out of Level 3 [1] (7) (6,895)
Level 3 assets, end of period $ 921 $ 567
[1] During the year ended December 31, 2017, transfers out of Level 3 assets primarily consisted of newly issued fixed-maturity securities purchased in the fourth quarter of 2016 for which observable inputs, most notably quoted prices, used to derive valuations were not yet readily available.