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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Available for sale securities, amortized cost	$ 10,956,847	$ 8,887,734
Held to maturity securities, allowance for credit losses	2,116	2,610
Held to Maturity, Fair value	$ 1,064,816	$ 1,029,444
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	55,056,730	55,056,730
Common stock, shares outstanding	48,355,373	48,006,386
Treasury stock, shares	6,701,357	7,050,344

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Amortized cost 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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