CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Loans held-for-sale, fair value disclosure	$ 266,306	$ 115,173
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)	167,405,730	166,800,623
Common stock, shares outstanding (in shares)	147,312,703	147,157,596
Treasury stock, shares at cost (in shares)	20,093,027	19,643,027