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Fair Value (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Carrying Value | $ 142,300,000 |  | $ 142,300,000 |  | $ 187,100,000 |  |  |
Discount percentage applied to real estate appraised values |  |  | 15.00% |  |  |  |  |
Discount percentage applied to lot development appraised values |  |  | 6.00% |  |  |  |  |
Partial charge-offs on impaired loans |  |  | 117,500,000 |  | 103,800,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 7,579,000 |  | 7,579,000 |  | 15,935,000 |  |  |
Impaired Financing Receivable, Related Allowance | 7,579,000 |  | 7,579,000 |  | 15,935,000 |  |  |
Impaired loans carried at fair value | 56,405,000 |  | 56,405,000 |  | 67,900,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 91,500,000 |  | 97,600,000 |  |  |
Book value of impaired loans carried at fair value | 62,000,000 |  | 62,000,000 |  | 78,000,000 |  |  |
Remaining amount of impaired loans carried at cost |  |  | 80,300,000 |  | 109,100,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | 5,200,000 |  | 10,700,000 |  |  |  |  |
MSR recorded at lower of cost or fair value | 8,346,000 | 10,069,000 | 8,346,000 | 10,069,000 | 9,301,000 | 8,809,000 | 10,259,000 | 10,488,000
Mortgage Servicing Rights Fair Value | 6,100,000 |  | 6,100,000 |  |  |  |  |
Valuation allowance of MSR | 1,611,000 | 680,000 | 1,611,000 | 680,000 | 1,021,000 | 1,067,000 | 680,000 | 748,000
MSRs recorded at cost | 2,200,000 |  | 2,200,000 |  |  |  |  |
Changes due to fair value adjustments | 544,000 | 0 | 590,000 | (68,000) | 273,000 |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | 33,500,000 |  | 33,500,000 |  | 42,272,000 |  |  |
OREO devaluations | 425,000 | 588,000 | 4,432,000 | 6,478,000 | 8,200,000 |  |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 5,575,000 |  | $ 5,575,000 |  | $ 10,116,000 |  |  |

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