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Goodwill and Other Intangible Assets - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 WNB Bancshares, Inc. [Member] | May 30, 2014 WNB Bancshares, Inc. [Member]
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Goodwill and Core Deposits Intangible [Line Items] |  |  |  |
Goodwill | $ 649,020 | $ 536,649 | $ 112,400 | $ 112,371
Finite-Lived Intangible Assets, Net | $ 15,700 | $ 6,345 | $ 10,800 |

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