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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Amortized cost of trading securities $ 432,000 $ 432,000
Amortized cost of investment securities available-for-sale 491,321,000 432,176,000
Allowance for loan losses $ 191,717,000 $ 204,809,000
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 51,660,507 51,387,071
Treasury stock, at cost, shares 8,224,727 8,498,163
Tax effect on accumulated other comprehensive income (loss) $ 1,405,000 $ 1,529,000
Investment available-for-sale, allowance for credit loss 0 0
Investment held-to-maturity, allowance for credit loss $ 0 $ 0
Series A [Member]    
Preferred stock, shares issued   1,340,000
Preferred stock, shares outstanding   1,340,000
Preferred stock, liquidation value   $ 25
Series B [Member]    
Preferred stock, shares issued   1,380,000
Preferred stock, shares outstanding   1,380,000
Preferred stock, liquidation value   $ 25
Series D [Member]    
Preferred stock, shares issued 960,000 960,000
Preferred stock, shares outstanding 960,000 960,000
Preferred stock, liquidation value $ 25 $ 25