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Investments - Summary of Available-for-Sale Debt Securities and Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and maturities (fair value)	$ 32,320	$ 773,673	$ 146,611	$ 873,355
Proceeds from sales of equity securities	48,486	0	53,651	0
Gross realized gains on sale of securities	882	53,893	1,899	54,779
Equity securities, FV-NI, Realized Gain	1,315	0	2,399	0
Gross realized losses on sale of securities	(192)	(66)	(1,656)	(485)
Equity securities, FV-NI, Realized Loss	0	0	0	0
Realized gains on sales of investment real estate	$ 0	0	$ 401	$ 0
Net realized gains on sales of AFS securities		$ 53,800

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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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