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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Trading securities, amortized cost $ 163 $ 162
Investment securities available-for-sale, amortized cost 2,177,761 1,522,812
Investment securities available-for-sale, allowance for credit loss 0 0
Investment securities held-to-maturity, fair value 490,764 469,186
Investment securities held-to-maturity, allowance for credit loss 0 0
Loans held for investment, allowance for credit losses $ 161,106 $ 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) 47,065,156 47,581,375
Treasury stock, at cost (in shares) 12,820,078 12,303,859
Accumulated other comprehensive income, tax (benefit) expense $ 11,484 $ 16,221