CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Held-to-maturity securities, allowance for credit loss	$ 159	$ 78	$ 99
Held-to-maturity securities, fair value	$ 3,146,427	$ 2,900,694	$ 2,121,065
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)	59,090,903	58,891,780	58,726,900
Treasury stock (in shares)	1,837,689	1,837,689	1,703,627
Series D Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25	$ 25	$ 25
Preferred stock, issued (in shares)	5,000,000	5,000,000	5,000,000
Preferred stock, outstanding (in shares)	5,000,000	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)	11,500	11,500	11,500
Preferred stock, outstanding (in shares)	11,500	11,500	11,500