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UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Statement of Financial Position [Abstract] |  |
Trading securities, amortized cost | $ 163 | $ 162
Investment securities available-for-sale, amortized cost | 1,663,633 | 1,522,812
Investment securities available-for-sale, allowance for credit loss | 0 | 0
Investment securities held-to-maturity, fair value | 441,759 | 469,186
Investment securities held-to-maturity, allowance for credit loss | 0 | 0
Loans held for investment, allowance for credit losses | $ 157,529 | $ 152,673
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) | 47,057,806 | 47,581,375
Treasury stock, at cost (in shares) | 12,827,428 | 12,303,859
Accumulated other comprehensive income, tax (benefit) expense | $ 22,803 | $ 16,221

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