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Consolidated Statements of Financial Condition (unaudited) (Parenthetical) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Amortized cost of trading securities $ 667,000 $ 667,000
Amortized cost of investment securities available-for-sale 653,673,000 955,646,000
Fair value of held to maturity securities 641,346,000 614,679,000
Allowance for loan and lease losses $ 238,271,000 $ 234,131,000
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 52,625,869 52,625,869
Common stock, shares outstanding 43,913,719 43,867,909
Treasury stock, at cost, shares 8,712,150 8,757,960
Tax effect on accumulated other comprehensive income (loss) $ 177,000 $ 1,182,000
Series A Preferred Stock    
Preferred stock, shares issued 1,340,000 1,340,000
Preferred stock, liquidation value $ 25 $ 25
Series B Preferred Stock    
Preferred stock, shares issued 1,380,000 1,380,000
Preferred stock, liquidation value $ 25 $ 25
Series C Convertible Preferred Stock    
Preferred stock, shares issued 84,000 84,000
Preferred stock, liquidation value $ 1,000 $ 1,000
Series D Preferred Stock Member    
Preferred stock, shares issued 960,000 960,000
Preferred stock, liquidation value $ 25 $ 25