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Loans (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items] |  |
Partial charge-offs on impaired loans | $ 108,300,000 | $ 103,800,000
Allowance for loans individually evaluated for impairment | 9,500,000 | 15,900,000
Recorded investment, related to loans | 33,700,000 | 52,700,000
TDRs included in nonaccrual loan totals | 98,600,000 | 100,400,000
TDRs included in accruing loan totals | 34,600,000 | 28,700,000
Nonaccrual TDRs considered current | 52,800,000 | 79,900,000
Specific reserves related to troubled debt restructuring | 4,400,000 | 9,100,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 5,100,000 | 4,000,000
Additional specific reserves related to troubled debt restructurings | 252,000 |
Modified substandard commercial loans, total recorded investment | 3,600,000 |
Modified substandard consumer loans, total recorded investment | 6,300,000 |
Recorded investment | 21,164,000 |
Financing Receivable With No Related Allowance Recorded [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Partial charge-offs on impaired loans | 91,000,000 | 83,700,000
Financing Receivable With A Related Allowance Recorded [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Partial charge-offs on impaired loans | 17,300,000 | 20,100,000
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded investment | 3,201,000 |
Accruing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded investment | 205,000 |
Nonaccrual [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded investment | $ 20,000,000 |

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