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Estimated Fair Values Estimated Fair Values (Information on Other Real Estate Owned) (Details) (Fair Value, Measurements, Nonrecurring, Fair Value, Inputs, Level 3, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Covered OREO |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Current year foreclosures | $ 28,187 | $ 28,101 | $ 89,817 | $ 92,245
Loan charge-offs recorded due to the measurement and initial recognition of OREO | 1,965 | 7,447 | 10,316 | 7,447
Write-downs recorded subsequent to forelosure for OREO | 2,060 | 11,431 | 13,382 | 15,997
Fair value of OREO remeasured in current period | 10,704 | 7,759 | 36,972 | 12,572
Non-covered OREO |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Current year foreclosures | 8,763 | 16,590 | 27,546 | 30,226
Loan charge-offs recorded due to the measurement and initial recognition of OREO | 1,498 | 1,385 | 2,086 | 2,053
Write-downs recorded subsequent to forelosure for OREO | 3,074 | 1,226 | 6,186 | 2,910
Fair value of OREO remeasured in current period | $ 6,865 | $ 5,813 | $ 17,719 | $ 12,380

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