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Investments - Realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Debt Securities, Available-for-sale [Abstract]    
Proceeds from sales or calls $ 106,037 $ 52,985
Gross realized gains from sales or calls 4,198 1,099
Gross realized losses from sales or calls $ 0 $ (47)