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Acquisitions - Narrative (Details) - Bank of America, National Association [Member] $ in Thousands | Sep. 30, 2014 USD ($) branch | May. 02, 2014 branch | Dec. 06, 2013 branch | Oct. 31, 2013 branch
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) | branch | 74 |  |  |
Customer accounts | $ 1,853,798 |  |  |
Loans receivable, net | 12,881 |  |  |
Property and equipment, net | $ 25,097 |  |  |
Premium on deposits | 1.99% |  |  |
Cash | $ 1,776,660 |  |  |
Core deposit intangible | 11,040 |  |  |
Goodwill | $ 31,225 |  |  |
New Mexico [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) | branch |  |  |  | 11
Washington, Oregon, and Idaho [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) | branch |  |  | 40 |
Arizona and Nevada [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired (in branches) | branch |  | 23 |  |

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