CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Held-to-maturity securities, allowance for credit loss	$ 347	$ 488
Held-to-maturity securities, fair value	$ 3,215,468	$ 2,949,821
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	5,011,500	5,011,500
Preferred stock, shares outstanding (in shares)	5,011,500	5,011,500
Common stock, stated value (usd per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	61,268,566	60,797,270
Treasury stock (in shares)	24,940	3,262
Series D Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25	$ 25
Preferred stock, shares issued (in shares)	5,000,000	5,000,000
Preferred stock, shares outstanding (in shares)	5,000,000	5,000,000
Series E Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25,000	$ 25,000
Preferred stock, shares issued (in shares)	11,500	11,500
Preferred stock, shares outstanding (in shares)	11,500	11,500