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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Trading securities, amortized cost $ 162 $ 432
Investment securities available-for-sale, amortized cost 503,421 432,176
Investment securities available-for-sale, allowance for credit loss 0 0
Investment securities held-to-maturity, fair value 363,653  
Investment securities held-to-maturity, allowance for credit loss 0  
Loans held for investment, allowance for credit losses $ 155,937 $ 204,809
Preferred stock, authorized (in shares) 10,000,000 10,000,000
Preferred stock, liquidation value $ 25 $ 25
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) 49,636,352 51,387,071
Treasury stock, at cost (in shares) 10,248,882 8,498,163
Accumulated other comprehensive income, tax $ 1,328 $ 1,529
Series A    
Preferred stock, issued (in shares)   1,340,000
Preferred stock, outstanding (in shares)   1,340,000
Series B    
Preferred stock, issued (in shares)   1,380,000
Preferred stock, outstanding (in shares)   1,380,000
Series D    
Preferred stock, issued (in shares)   960,000
Preferred stock, outstanding (in shares)   960,000