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Summary of Significant Accounting Policies - Business Combinations (Details) (USD $) |  |  |  |  |  | 0 Months Ended |  | 0 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 Bank of America, National Association branch | May 02, 2014 Bank of America, National Association | Nov. 01, 2012 South Valley Bancorp, Inc. | Nov. 01, 2012 South Valley Bancorp, Inc. | Dec. 16, 2011 Western National Bank | Dec. 16, 2011 Western National Bank | Oct. 14, 2011 Charter Bank branch | Oct. 31, 2013 New Mexico Bank of America, National Association branch | Dec. 06, 2013 Washington, Oregon, and Idaho Bank of America, National Association branch | May 02, 2014 Arizona and Nevada Bank of America, National Association branch | Nov. 01, 2012 Central and Southern Oregon South Valley Bancorp, Inc. branch | Dec. 16, 2011 Arizona Western National Bank branch | Oct. 14, 2011 Albuquerque, New Mexico Charter Bank branch | Oct. 14, 2011 Santa Fe, New Mexico Charter Bank branch
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of branches acquired (in branches) |  |  |  | 74 |  |  |  |  |  | 6 | 11 | 40 | 23 | 24 | 3 | 4 | 2
Deposit accounts |  |  |  |  | $ 1,900,000,000 |  | $ 736,000,000 |  | $ 136,000,000 | $ 255,000,000 |  |  |  |  |  |  |
Net loans |  |  |  |  | 13,000,000 |  | 361,000,000 |  | 143,000,000 |  |  |  |  |  |  |  |
Branch properties |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Premium on deposits |  |  |  |  | 1.99% |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  |  |  |  | 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, goodwill | 291,503,000 | 260,277,000 | 251,653,000 | 31,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net covered loans |  |  |  |  |  |  | 108,000,000 |  |  |  |  |  |  |  |  |  |
Transaction deposit accounts |  |  |  |  |  |  | 533,000,000 |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | 44,000,000 |  | 53,000,000 |  |  |  |  |  |  |  |  |
Consideration paid in stock |  |  |  |  |  | 34,000,000 |  |  |  |  |  |  |  |  |  |  |
Cash resulting from the collection of certain earn-out assets |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Assets acquired |  |  |  |  |  |  |  |  | 177,000,000 |  |  |  |  |  |  |  |
Foreclosed real estate |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |
Liabilities assumed |  |  |  |  |  |  |  |  | 153,000,000 |  |  |  |  |  |  |  |
Cash received from the FDIC |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |
Unamortized premium on acquisition |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of financial assets (as defined) recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -Glossary Financial Asset -URI http://asc.fasb.org/extlink&oid=6512957 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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