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Investments - Realized gains and losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Proceeds from sales or calls	$ 25,442	$ 77,375	$ 147,811	$ 280,991
Gross realized gains from sales or calls	1,035	1,709	5,539	5,316
Gross realized losses from sales or calls	$ (978)	$ (24)	$ (1,342)	$ (120)

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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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