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Investments - Realized gains and losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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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)

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