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UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Trading securities, amortized cost $ 162 $ 162
Investment securities available-for-sale, amortized cost 1,445,218 1,522,812
Investment securities available-for-sale, allowance for credit loss 0 0
Investment securities held-to-maturity, fair value 471,615 469,186
Investment securities held-to-maturity, allowance for credit loss 0 0
Loans held for investment, allowance for credit losses $ 151,884 $ 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) 47,611,402 47,581,375
Treasury stock, at cost (in shares) 12,273,832 12,303,859
Accumulated other comprehensive income, tax (benefit) expense $ (13,497) $ (16,221)