CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Held-to-maturity securities, allowance for credit loss	$ 395	$ 457	$ 479
Held-to-maturity securities, fair value	$ 2,860,970	$ 2,910,550	$ 3,121,820
Preferred stock, authorized (in shares)	20,000,000	20,000,000	20,000,000
Common stock, stated value (usd per share)	$ 1.00	$ 1.00	$ 1.00
Common stock, authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, issued (in shares)	67,042,228	66,560,182	66,546,351
Treasury stock (in shares)	81,019	64,955	64,808
Series D Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25	$ 25	$ 25
Preferred stock, issued (in shares)	0	5,000,000	5,000,000
Preferred stock, outstanding (in shares)	0	5,000,000	5,000,000
Series E Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25,000	$ 25,000	$ 25,000
Preferred stock, issued (in shares)	0	11,500	11,500
Preferred stock, outstanding (in shares)	0	11,500	11,500
Series F Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25,000	$ 25,000	$ 25,000
Preferred stock, issued (in shares)	17,000	0	0
Preferred stock, outstanding (in shares)	17,000	0	0