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Cash, Due from Banks, Interest-Bearing Deposits and Federal Funds Sold (Tables) | 12 Months Ended
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Dec. 31, 2014
Cash And Cash Equivalents [Abstract] |
Summary of Average Amount of Required Reserves | The average amount of required reserves for each of the years ended December 31, 2014 and 2013 is included in the following table:
|  | December 31, |
|  | 2014 |  |  | 2013 |
|  | (Dollars in thousands) |
Vault cash and funds on deposit with the Federal Reserve Bank |  | $ | 1,804,028 |  |  | $ | 1,758,908 |
Average required reserves |  |  | 44,711 |  |  |  | 37,456 |

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- Definition Tabular disclosure of reserves reported to other federal agencies or authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 2 + Details
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