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Earnings Per Common Share (EPS) (Details Textuals) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Earnings Per Common Share Eps Textuals [Abstract]          
Subordinated debentures $ 750,000 $ 750,000 $ 750,000 $ 750,000  
Subordinated debt issuance year 2006 2006 2006 2006  
Subordinated debt maturity year 2036 2036 2036 2036  
Preferred stock, shares authorized 20,000,000   20,000,000   20,000,000
Redemption amount, per preferred shares $ 1,000   $ 1,000    
Redemption amount. per depository shares $ 1   $ 1    
Preferred shares, par value $ 1.667   $ 1.667   $ 1.66