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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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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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