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Sale Of Vision Bank (Details) (USD $) | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2009
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Sale Of Subsidiary Bank [Line Items] |  |  |  |  |  |
Deposits | $ 5,257,517,000 |  | $ 5,095,420,000 |  |  |
Allowance for loan losses | 120,174,000 | 148,530,000 | 143,575,000 | 120,676,000 | 119,674,000 | 116,717,000
Recognized pre-tax gain, net of expenses related to sale | 22,000,000 |  |  |  |  |
Vision Bank [Member] |  |  |  |  |  |
Sale Of Subsidiary Bank [Line Items] |  |  |  |  |  |
Performing loans sold | 354,000,000 |  |  |  |  |
Deposits | 520,000,000 |  |  |  |  |
Fixed assets | 12,500,000 |  |  |  |  |
Other miscellaneous assets and liabilities for purchase price | 27,900,000 |  |  |  |  |
Performing Loans [Member] |  |  |  |  |  |
Sale Of Subsidiary Bank [Line Items] |  |  |  |  |  |
Allowance for loan losses | 22,000,000 |  |  |  |  |
Non-Performing Loans [Member] |  |  |  |  |  |
Sale Of Subsidiary Bank [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 88,000,000 |  |  |  |  |

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