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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Statement Of Financial Position [Abstract] |  |
Securities available for sale, amortized cost | $ 5,410,502 | $ 4,637,610
Securities held to maturity, fair value | 1,517,688 | 1,611,004
Property and equipment, accumulated depreciation | 266,241 | 249,527
Right of use assets, accumulated amortization | $ 20,309 | $ 12,194
Preferred stock, par value per share | $ 20.00 | $ 20.00
Common stock, par value per share | $ 3.33 | $ 3.33

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