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Contingencies (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Lawsuit | Jun. 30, 2014 USD ($)
Loss Contingencies [Line Items] |  |
Unused commitments to extend credit | $ 2,540.0 | $ 2,223.0
Standby Letters of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Maximum potential exposure to credit loss in the event of nonperformance | $ 134.0 | $ 147.5
Letters of credit, maturity term - maximum | 3 years |
Collateral held, fair value | $ 28.7 |
Pending or Threatened Litigation, Stanford Financial Group [Member] |  |
Legal Proceedings [Abstract] |  |
Lawsuits naming entity as defendant, number | Lawsuit | 2 |

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