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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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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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