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Investments - Realized gains and losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Securities, Available-for-sale [Abstract]
Proceeds from sales or calls	$ 590	$ 16,114	$ 590	$ 122,151
Gross realized gains from sales or calls	0	306	0	4,504
Gross realized losses from sales or calls	$ (79)	$ (364)	$ (79)	$ (364)

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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