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UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Trading securities, amortized cost $ 163 $ 163
Investment securities available-for-sale, amortized cost 1,993,754 2,177,761
Investment securities available-for-sale, allowance for credit loss 0 0
Investment securities held-to-maturity, fair value 483,657 490,764
Investment securities held-to-maturity, allowance for credit loss 0 0
Loans held for investment, allowance for credit losses $ 156,563 $ 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) 47,216,571 47,065,156
Treasury stock, at cost (in shares) 12,668,663 12,820,078
Accumulated other comprehensive income, tax (benefit) expense $ 14,316 $ 11,484