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Loans (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial Charge-Offs On Impaired Loans | $ 102,900,000 |  | $ 105,100,000
Allowance for loan losses individually evaluated for impairment | 8,260,000 |  | 8,276,000
Recorded investment, related to loans | 27,100,000 |  | 28,800,000
TDRs included in nonaccrual loan totals | 84,300,000 |  | 84,700,000
TDRs included in accruing loan totals | 24,400,000 |  | 29,900,000
Nonaccrual TDRs considered current | 54,800,000 |  | 52,600,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 4,400,000 |  | 5,000,000
Specific reserves related to troubled debt restructuring | 5,600,000 |  |
Additional specific reserves related to troubled debt restructurings | 238,000 | 300,000 |
Modified substandard commercial loans, total recorded investment | 800,000 |  |
Modified substandard consumer loans, total recorded investment | 6,600,000 |  |
Loan Modifications on Nonacrrual status | 300,000 | 6,200,000 |
Loan past due period before entering default status | 30 days |  |
Loans modified during period | 7,100,000 | 21,200,000 |
Financing Receivable With No Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial Charge-Offs On Impaired Loans | 96,900,000 |  | 96,900,000
Financing Receivable With A Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial Charge-Offs On Impaired Loans | 6,000,000 |  | 8,200,000
Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment | 648,000 |  | 1,540,000
Accruing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans modified during period | 768,000 | 205,000 |
Nonaccrual [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans modified during period | $ 6,300,000 | $ 21,000,000 |

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