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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Amortized cost of trading securities $ 162 $ 182
Amortized cost of investment securities available-for-sale 412,900 1,074,475
Allowance for loan losses $ 235,313 $ 116,539
Preferred stock, shares authorized 10,000,000 10,000,000
Common stock, par value $ 1 $ 1
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 59,885,234 59,885,234
Common stock, shares outstanding 51,344,586 51,398,956
Treasury stock, at cost, shares 8,540,648 8,486,278
Tax effect on accumulated other comprehensive income (loss) $ (753) $ 206
Investment available-for-sale, allowance for credit loss $ 0 $ 0
Series A    
Preferred stock, shares issued 1,340,000 1,340,000
Preferred stock, shares outstanding 1,340,000 1,340,000
Preferred stock, liquidation value $ 25 $ 25
Series B    
Preferred stock, shares issued 1,380,000 1,380,000
Preferred stock, shares outstanding 1,380,000 1,380,000
Preferred stock, liquidation value $ 25 $ 25
Series D    
Preferred stock, shares issued 960,000 960,000
Preferred stock, shares outstanding 960,000 960,000
Preferred stock, liquidation value $ 25 $ 25