Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Mortgages Held-for-sale, Fair Value Disclosure	$ 5,570,000	$ 39,396,000
Debt Securities, Available-for-sale, Amortized Cost	14,419,133,000	12,097,533,000
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	140,000,000	140,000,000
Common stock, shares issued	122,160,705	117,870,372
Treasury stock, shares	476,392	497,413