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UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Trading securities, amortized cost $ 163 $ 162
Investment securities available-for-sale, amortized cost 903,798 503,421
Investment securities available-for-sale, allowance for credit loss 0 0
Investment securities held-to-maturity, fair value 329,969 363,653
Investment securities held-to-maturity, allowance for credit loss 0  
Loans held for investment, allowance for credit losses $ 157,075 $ 155,937
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) 48,673,113 49,636,352
Treasury stock, at cost (in shares) 11,212,121 10,248,882
Accumulated other comprehensive income, tax $ (3,007) $ 1,328