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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

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