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Investments - Realized gains and losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Proceeds from sales or calls | $ 10,170 | $ 25,442 | $ 10,760 | $ 147,811
Gross realized gains from sales or calls | 117 | 1,035 | 117 | 5,539
Gross realized losses from sales or calls | $ 0 | $ (978) | $ (79) | $ (1,342)

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