Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investment securities, available for sale, amortized cost	$ 11,248,458	$ 11,193,152
Investment securities, held to maturity, fair value	14,713,496	12,375,420
Equity and other securities, cost	$ 1,191,927	$ 933,766
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	10,000,000	10,000,000
Preferred stock, liquidation preference per share	$ 25	$ 25
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	179,436,779	179,436,779
Common stock issuable, shares	12,124	14,031
Treasury stock, common shares	13,555,383	10,165,419
Series A Series C Series And E Preferred Stock [Member]
Preferred stock, shares issued	350,000	350,000
Preferred stock, shares outstanding	350,000	350,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Series F And Series G Preferred Stock [Member]
Preferred stock, shares issued	140,000	140,000
Preferred stock, shares outstanding	140,000	140,000
Preferred stock, liquidation preference per share	$ 10,000	$ 10,000