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Loans (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
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Classification removed | $ 728,000 |  | $ 3,600,000 |  |
Partial Charge-Offs On Impaired Loans |  |  | 83,300,000 |  | 105,100,000
Impaired Financing Receivable, Related Allowance | 9,297,000 |  | 9,297,000 |  | 8,276,000
Recorded investment, related to loans | 18,000,000 |  | 18,000,000 |  | 28,800,000
TDRs included in nonaccrual loan totals | 78,500,000 |  | 78,500,000 |  | 84,700,000
TDRs included in accruing loan totals | 24,500,000 |  | 24,500,000 |  | 29,900,000
Nonaccrual TDRs considered current | 57,200,000 |  | 57,200,000 |  | 52,600,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 6,900,000 |  | 6,900,000 |  | 5,000,000
Specific reserves related to troubled debt restructuring | 7,700,000 |  | 7,700,000 |  | 5,600,000
Additional specific reserves related to troubled debt restructurings | 474,000 | 167,000 | 745,000 | 1,200,000 |
Modified substandard commercial loans, total recorded investment | 541,000 | 2,100,000 | 541,000 | 2,100,000 |
Modified substandard consumer loans, total recorded investment | 19,600,000 | 20,500,000 | 19,600,000 | 20,500,000 |
Loan Modifications on Nonacrrual status | 751,000 | 1,200,000 | 3,200,000 | 7,200,000 |
Loan past due period before entering default status |  |  | 30 days |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | 5,603,000 | 15,705,000 | 7,162,000 | 17,240,000 |
Financing Receivable With No Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 78,500,000 |  | 96,900,000
Financing Receivable With A Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 4,800,000 |  | 8,200,000
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period | 634,000 | 1,224,000 | 670,000 | 1,936,000 |
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 5,906,000 |  | 5,906,000 |  | 1,540,000
Accruing [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans modified during period | 376,000 | 91,000 | 496,000 | 362,000 |
Nonaccrual [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans modified during period | $ 5,200,000 | $ 15,600,000 | $ 6,700,000 | $ 16,900,000 |

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