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Cash Due from Banks Interest-Bearing Deposits and Federal Funds Sold (Tables)
 12 Months Ended
Dec. 31, 2012
Cash Due from Banks Interest Bearing Deposits and Federal Funds Sold [Abstract]  
Summary of average amount of required reserves

The average amount of required reserves for each of the years ended December 31, 2012 and 2011 is included in the following table:

 

                 
    December 31,  
    2012     2011  
    (Dollars in thousands)  

Vault cash and excess funds with the Federal Reserve Bank

   $ 1,809,584     $ 1,554,010  

Average required reserves

     38,949       35,744