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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Amortized cost of trading securities $ 647,000 $ 647,000
Amortized cost of investment securities available-for-sale 872,895,000 648,800,000
Fair value of held to maturity securities 425,066,000 497,681,000
Allowance for loan and lease losses $ 165,742,000 $ 167,509,000
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 44,005,741 43,947,442
Treasury stock, at cost, shares 8,620,003 8,678,427
Tax effect on accumulated other comprehensive income (loss) $ (2,904,000) $ (564,000)
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