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Loans (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial charge-offs on impaired loans |  | $ 117,500,000 | $ 103,800,000
Allowance for loan losses individually evaluated for impairment | 7,579,000 | 7,579,000 | 15,935,000
Recorded investment, related to loans | 27,000,000 | 27,000,000 | 52,700,000
TDRs included in nonaccrual loan totals | 86,800,000 | 86,800,000 | 100,400,000
TDRs included in accruing loan totals | 31,500,000 | 31,500,000 | 28,700,000
Nonaccrual TDRs considered current | 60,500,000 | 60,500,000 | 79,900,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 4,100,000 | 4,100,000 | 4,000,000
Specific reserves related to troubled debt restructuring | 5,500,000 | 5,500,000 | 9,100,000
Additional specific reserves related to troubled debt restructurings | 167,000 | 1,200,000 |
Modified substandard commercial loans, total recorded investment | 2,100,000 | 2,100,000 |
Modified substandard consumer loans, total recorded investment | 20,500,000 | 20,500,000 |
Loan Modifications on Nonacrrual status | 1,200,000 | 7,200,000 |
Loan modification coverage period |  | 12 days |
Loan past due period before entering default status |  | 30 days |
Loans modified during period |  | 15,700,000 |
Recorded investment | 17,200,000 | 17,200,000 |
Financing Receivable With No Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial charge-offs on impaired loans |  | 111,500,000 | 83,700,000
Financing Receivable With A Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial charge-offs on impaired loans |  | 6,000,000 | 20,100,000
Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment | 1,134,000 | 1,134,000 | 4,431,000
Accruing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans modified during period |  | 91,000 |
Recorded investment | 362,000 | 362,000 |
Nonaccrual [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans modified during period |  | 15,600,000 |
Recorded investment | $ 16,900,000 | $ 16,900,000 |

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