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Investments - Realized gains and losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Proceeds from sales or calls | $ 16,114 | $ 150,441 | $ 122,151 | $ 203,426
Gross realized gains from sales or calls | 306 | 2,508 | 4,504 | 3,607
Gross realized losses from sales or calls | $ (364) | $ (49) | $ (364) | $ (96)

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