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UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Statement of Financial Position [Abstract] |  |
Trading securities, amortized cost | $ 163 | $ 163
Investment securities available-for-sale, amortized cost | 2,267,582 | 2,177,761
Investment securities available-for-sale, allowance for credit loss | 0 | 0
Investment securities held-to-maturity, fair value | 284,249 | 490,764
Investment securities held-to-maturity, allowance for credit loss | 0 | 0
Allowance for credit losses | 161,500 | 161,106
Loans held for investment, allowance for credit losses | $ 161,500 | $ 161,106
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) | 46,558,932 | 47,065,156
Treasury stock, at cost (in shares) | 13,326,302 | 12,820,078
Accumulated other comprehensive income, tax (benefit) expense | $ 4,490 | $ 11,484

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