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Fair Value (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Carrying Value | $ 118,200,000 |  | $ 118,200,000 |  | $ 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 |  |  | 83,300,000 |  | 105,100,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 9,297,000 |  | 9,297,000 |  | 8,276,000 |  |  |
Impaired Financing Receivable, Related Allowance | 9,297,000 |  | 9,297,000 |  | 8,276,000 |  |  |
Impaired loans carried at fair value | 38,455,000 |  | 38,455,000 |  | 53,900,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 68,600,000 |  | 91,600,000 |  |  |
Book value of impaired loans carried at fair value | 46,000,000 |  | 46,000,000 |  | 59,000,000 |  |  |
Remaining amount of impaired loans carried at cost |  |  | 72,200,000 |  | 78,200,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | 6,000,000 | 5,200,000 | 8,100,000 | 10,700,000 |  |  |  |
MSR recorded at lower of cost or fair value | 9,132,000 | 8,346,000 | 9,132,000 | 8,346,000 | 7,763,000 | 8,260,000 | 8,809,000 | 9,301,000
Mortgage Servicing Rights Fair Value | 2,400,000 |  | 2,400,000 |  |  |  |  |
Valuation allowance of MSR | 1,071,000 | 1,611,000 | 1,071,000 | 1,611,000 | 2,324,000 | 2,084,000 | 1,067,000 | 1,021,000
MSRs recorded at cost | 6,700,000 |  | 6,700,000 |  |  |  |  |
Changes due to fair value adjustments | 1,013,000 | (544,000) | 1,253,000 | (590,000) |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 35,412,000 |  | 35,412,000 |  | 35,718,000 |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | 19,500,000 |  | 19,500,000 |  | 19,900,000 |  |  |
OREO valuation adjustments | 2,030,000 | 425,000 | 2,229,000 | 4,432,000 |  |  |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 7,469,000 |  | 7,469,000 |  | 5,100,000 |  |  |
Financing Receivable, not collateral dependent [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 1,828,000 |  | $ 1,828,000 |  | $ 3,176,000 |  |  |

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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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