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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Mortgages Held-for-sale, Fair Value Disclosure $ 39,396,000 $ 9,181,000
Debt Securities, Available-for-sale, Amortized Cost 12,097,533,000 8,435,531,000
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 0 $ 0
Preferred stock, par value $ 1 $ 1
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares issued 0 6,000
Common stock, par value $ 5 $ 5
Common stock, shares authorized 140,000,000 140,000,000
Common stock, shares issued 117,870,372 112,795,605
Treasury stock, shares 497,413 445,952