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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Pledged securities that can be sold or repledged $ 2,136,712 $ 1,631,267
Investment securities, available for sale, amortized cost 12,138,636 8,919,324
Investment securities, held to maturity, fair value 2,864,147 3,538,282
Other, fair value $ 554,059 $ 328,742
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 159,563,512 132,312,931
Common stock issuable, shares 36,644 41,330
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