CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Loans held-for-sale, fair value disclosure	$ 202,216	$ 216,647
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	22,000,000	22,000,000
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	342,857,143	342,857,143
Common stock, shares issued (in shares)	169,107,609	168,132,522
Common stock, shares outstanding (in shares)	147,071,532	148,039,495
Treasury stock, shares at cost (in shares)	22,036,077	20,093,027