Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Securities held to maturity	$ 928,696	$ 961,870
Amortized cost	$ 2,900,216	$ 2,635,495
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)	250,000,000
Common stock, shares issued (in shares)	97,722,397
Common stock, shares outstanding (in shares)	92,881,329	94,636,207
Treasury stock (in shares)	4,841,068	3,086,190