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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Securities available for sale, amortized cost $ 5,766,234 $ 4,637,610
Securities held to maturity, fair value 1,467,581 1,611,004
Property and equipment, accumulated depreciation 271,801 249,527
Right of use assets, accumulated amortization $ 23,330 $ 12,194
Preferred stock, par value per share $ 20.00 $ 20.00
Common stock, par value per share $ 3.33 $ 3.33