Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investment securities, available for sale, amortized cost	$ 14,131,000	$ 10,691,000
Investment securities, held to maturity, fair value	13,509,000	14,308,000
Equity and other securities, cost	1,201,000	1,125,000
Financing receivable, unamortized purchase discount	$ 990,000	$ 868,000
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	20,000,000	20,000,000
Common stock par value (in USD per share)	$ 0.50	$ 0.50
Common stock authorized (in shares)	250,000,000	250,000,000
Common stock issued (in shares)	179,436,779	179,436,779
Common stock issuable (in shares)	11,560	12,217
Treasury stock (in shares)	12,223,276	13,300,298
Preferred Series E
Preferred stock, shares issued (in shares)	350,000	350,000
Preferred stock, liquidation preference per share (in USD per share)	$ 1,000	$ 1,000
Preferred stock, shares outstanding (in shares)	350,000	350,000
Series F, Series G, Series I And Series J Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000	$ 10,000
Preferred stock, shares outstanding (in shares)	215,000	140,000
Series H Preferred Stock
Preferred stock, shares issued (in shares)	10,000,000	10,000,000
Preferred stock, liquidation preference per share (in USD per share)	$ 25	$ 25
Preferred stock, shares outstanding (in shares)	10,000,000	10,000,000