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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Statement Of Financial Position [Abstract] |  |
Securities available for sale, amortized cost | $ 6,943,511 | $ 5,766,234
Securities held to maturity, fair value | 1,385,967 | 1,467,581
Property and equipment, accumulated depreciation | 272,213 | 271,801
Right of use assets, accumulated amortization | $ 31,365 | $ 23,330
Preferred stock, par value per share | $ 20.00 | $ 20.00
Common stock, par value per share | $ 3.33 | $ 3.33

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