Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Securities held to maturity	$ 1,003,497	$ 1,002,544
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 5.00	$ 5.00
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	66,484,225	66,484,225
Common stock, shares outstanding (in shares)	63,739,467	63,565,690
Treasury stock (in shares)	2,744,758	2,918,535