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Subsequent Event (Details) (USD $) | Sep. 30, 2013 office | Sep. 30, 2012 | Jul. 18, 2013 Bank of America, National Association branch | Nov. 26, 2013 Subsequent Event office WesternStates
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Subsequent Event [Line Items] |  |  |  |
Deposits |  |  | $ 1,500,000,000 |
Loans |  |  | 11,000,000 |
Premium on deposits |  |  | 2.60% |
Number of branches acquired (in branches) |  |  | 51 |
Number of offices (in offices) | 182 |  |  | 232
Number of states in which entity operates |  |  |  | 8
Assets | 13,082,859,000 | 12,472,944,000 |  | 15,000,000,000
Deposits |  |  |  | $ 11,000,000,000

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