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UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Statement of Financial Position [Abstract] |  |
Trading securities, amortized cost | $ 163 | $ 163
Investment securities available-for-sale, amortized cost | 2,597,789 | 2,444,135
Investment securities available-for-sale, allowance for credit loss | 0 | 0
Investment securities held-to-maturity, fair value | 262,865 | 267,174
Investment securities held-to-maturity, allowance for credit loss | 0 | 0
Allowance for credit losses | $ 197,782 | $ 175,863
Common stock, par value (in dollars per share) | $ 1 | $ 1
Common stock, authorized (in shares) | 100,000,000 | 100,000,000
Common stock, issued (in shares) | 59,885,234 | 59,885,234
Common stock, outstanding (in shares) | 44,264,922 | 45,440,269
Treasury stock, at cost (in shares) | 15,620,312 | 14,444,965
Accumulated other comprehensive income, tax (benefit) expense | $ 3,519 | $ 16,091

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