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Fair Values - Narrative (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Discount percentage applied to real estate appraised values | 15.00% |  |  |
Discount percentage applied to lot development appraised values | 6.00% |  |  |
Impaired financing receivable, carrying value | $ 137,200,000 | $ 187,100,000 |  |
Partial charge-offs on impaired loans | 105,100,000 | 103,800,000 |  |
Allowance for loans individually evaluated for impairment | 8,276,000 | 15,935,000 |  |
Book value of impaired loans carried at fair value | 59,000,000 | 78,000,000 |  |
Impaired loans carried at fair value | 53,932,000 | 67,900,000 |  |
Partial charge-Offs on impaired loans carried at fair value | 91,600,000 | 97,600,000 |  |
Remaining amount of impaired loans carried at cost | 78,200,000 | 109,100,000 |  |
Impaired Financing Receivable, carried at fair value, related expense | 16,000,000 | 37,400,000 | 59,200,000 |
MSR recorded at lower of cost or fair value | 7,763,000 | 9,301,000 | 10,488,000 | 10,780,000
Mortgage Servicing Rights, at fair value | 6,600,000 |  |  |
Valuation allowance of MSR | 2,324,000 | 1,021,000 | 748,000 | 574,000
MSRs recorded at cost | 1,200,000 |  |  |
Valuation allowance for impairment of recognized servicing assets, provisions (recoveries) | 1,303,000 | 273,000 | 174,000 |
Estimated fair value of other real estate owned (OREO) | 19,900,000 | 23,700,000 |  |
OREO devaluations | 6,872,000 | 8,219,000 | 13,206,000 |
Commercial receivables, excluding commercial, financial, and agricultural |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | $ 5,096,000 | $ 10,116,000 |  |

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