CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Interest-bearing deposits in banks and other financial institutions, collateral	$ 2,453	$ 4,270
Amortized cost	4,444,676	4,504,342
Allowance for credit losses	8	8
Held-to-maturity securities, fair value	949,727	985,931
Allowance for credit losses	$ 192,629	$ 186,126
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, issued (in shares)	76,133,596	76,095,094
Treasury stock, shares (in shares)	16,049,631	15,557,263