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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Securities held to maturity, fair value $ 1,643,416 $ 1,468,258
Unearned income on loans $ 51,642 $ 56,131
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares issued 110,877 110,877
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 176,595,060 175,450,303
Treasury stock, shares 1,153,390 1,458,045