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Investments - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and maturities (fair value)	$ 223,266	$ 255,938	$ 128,370
Proceeds from sales of equity securities	29,680	8,285	77,640
Gross realized gains on sale of securities:	790	326	458
Equity Securities, FV-NI, Realized Gain	367	714	2,415
Gross realized losses on sale of securities:	(298)	(3,129)	(150)
Equity Securities, FV-NI, Realized Loss	(14,787)	0	(153)
Realized gains on sales of investment real estate	$ 1,213	$ 0	$ 0

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Amount of realized gain on 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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