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Fair Value Measurements - Summary of Available-for-Sale Fixed Maturity Securities Measured at Fair Value on a Recurring Basis (Details) - Available-for-sale fixed maturity and equity securities - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance $ 4,442 $ 4,680 $ 5,000
Transfers in to Level 3 3,010 0 0
Transfers out of Level 3 (7,238) 0 0
Purchases 214 0
Sales 0 0 0
Maturities and calls (452) (320)
Amortization of discount 0 0 0
Total gains or losses (realized/unrealized) - Included in earnings (171) 0 0
Total gains or losses (realized/unrealized) - Included in other comprehensive income 0 0 0
Ending balance $ 43 $ 4,442 $ 4,680