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Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Pledged securities that can be sold or repledged $ 519,063 $ 1,203,473
Investment securities, available for sale, amortized cost 12,640,244 13,338,301
Investment securities, held to maturity, fair value 2,865,885 2,451,222
Other, fair value $ 461,296 $ 461,118
Preferred stock, par value $ 1.00 $ 1.00
Preferred stock, shares authorized 1,000,000 1,000,000
Common stock, par value $ 0.50 $ 0.50
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 159,825,445 159,945,678
Common stock issuable, shares 28,740 32,403
Treasury stock, shares 6,073,095 3,764,742
Series A and Series C [Member]    
Preferred stock, shares issued 731,500 731,500
Preferred stock, shares outstanding 731,500 731,500
Preferred stock, liquidation preference per share $ 1,000 $ 1,000
Series D Preferred Stock [Member]    
Preferred stock, shares issued 50,000 50,000
Preferred stock, shares outstanding 50,000 50,000
Preferred stock, liquidation preference per share $ 10,000 $ 10,000