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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Amortized cost of trading securities $ 647,000 $ 647,000
Amortized cost of investment securities available-for-sale 1,248,749,000 854,511,000
Fair value of held to maturity securities 0 410,353,000
Allowance for loan losses $ 162,488,000 $ 164,231,000
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 51,328,431 51,293,924
Treasury stock, at cost, shares 8,556,803 8,591,310
Tax effect on accumulated other comprehensive income (loss) $ (1,562) $ (1,677)
Series A    
Preferred stock, shares issued 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, liquidation value $ 25 $ 25
Series D    
Preferred stock, shares issued 960,000 960,000
Preferred stock, liquidation value $ 25 $ 25