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Acquisitions (Narrative) (Details) (USD $) | Dec. 31, 2012 | Sep. 30, 2012 | Oct. 31, 2012 South Valley Bank [Member] branches | Oct. 31, 2012 Received from South Valley [Member] South Valley Bank [Member]
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Business Acquisition [Line Items] |  |  |  |
Loans receivable, net |  |  | $ 343,510,000 | $ 383,170,000
Covered loans receivable, net |  |  | 107,075,000 | 107,075,000
Customer accounts |  |  | 735,415,000 | 735,415,000
Transaction deposits acquired | 3,571,987,000 | 2,946,453,000 | 533,000,000 |
Number of branches acquired (in branches) |  |  | 24 |
Total considerartion |  |  | 43,895,000 |
Equity Issued |  |  | 33,492,000 |
Cash paid |  |  | 10,403,000 |
Potential reduction in purchase price, earn-out assets |  |  | $ 14,000,000 |

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