CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Debt securities held-to-maturity fair value	$ 6,176,976	$ 7,363,587
Realizable value of equity securities	$ 236,711	$ 230,388
Preferred stock, shares authorized (in shares)	30,000,000	30,000,000
Preferred stock, shares issued (in shares)	885,726	885,726
Preferred stock, shares outstanding (in shares)	885,726	885,726
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	170,000,000	170,000,000
Common stock, shares, issued (in shares)	104,950,834	104,921,229
Common stock, shares, outstanding (in shares)	63,866,681	65,719,385
Treasury stock (in shares)	41,084,153	39,201,844