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Fair Value (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Carrying Value | $ 126,100,000 |  | $ 126,100,000 |  | $ 137,200,000 |  |  |
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 |  |  | 96,800,000 |  | 105,100,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 7,466,000 |  | 7,466,000 |  | 8,276,000 |  |  |
Impaired Financing Receivable, Related Allowance | 7,466,000 |  | 7,466,000 |  | 8,276,000 |  |  |
Impaired loans carried at fair value | 46,749,000 |  | 46,749,000 |  | 53,900,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 83,400,000 |  | 91,600,000 |  |  |
Book value of impaired loans carried at fair value | 51,000,000 |  | 51,000,000 |  | 59,000,000 |  |  |
Remaining amount of impaired loans carried at cost |  |  | 75,100,000 |  | 78,200,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | (200,000) | 4,400,000 | 2,100,000 | 8,700,000 |  |  |  |
MSR recorded at lower of cost or fair value | 8,260,000 | 8,809,000 | 8,260,000 | 8,809,000 | 7,763,000 | 8,121,000 | 8,975,000 | 9,301,000
Mortgage Servicing Rights Fair Value | 5,800,000 |  | 5,800,000 |  |  |  |  |
Valuation allowance of MSR | 2,084,000 | 1,067,000 | 2,084,000 | 1,067,000 | 2,324,000 | 2,262,000 | 1,021,000 | 1,021,000
MSRs recorded at cost | 2,500,000 |  | 2,500,000 |  |  |  |  |
Changes due to fair value adjustments | (178,000) | 46,000 | (240,000) | 46,000 |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | 17,200,000 |  | 17,200,000 |  | 19,900,000 |  |  |
OREO valuation adjustments | 600,000 | 2,648,000 | 199,000 | 4,007,000 |  |  |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 4,255,000 |  | 4,255,000 |  | 5,100,000 |  |  |
Financing Receivable, not collateral dependent [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 3,211,000 |  | $ 3,211,000 |  | $ 3,176,000 |  |  |

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