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Loans (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Troubled Debt Restructuring, Classification removed | $ 2,872,000 |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 96,800,000 |  | 105,100,000
Allowance for loan losses individually evaluated for impairment | 7,466,000 |  | 7,466,000 |  | 8,276,000
Recorded investment, related to loans | 24,200,000 |  | 24,200,000 |  | 28,800,000
TDRs included in nonaccrual loan totals | 81,900,000 |  | 81,900,000 |  | 84,700,000
TDRs included in accruing loan totals | 22,500,000 |  | 22,500,000 |  | 29,900,000
Nonaccrual TDRs considered current | 59,000,000 |  | 59,000,000 |  | 52,600,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 5,100,000 |  | 5,100,000 |  | 5,000,000
Specific reserves related to troubled debt restructuring | 5,000,000 |  | 5,000,000 |  | 5,600,000
Additional specific reserves related to troubled debt restructurings | 33,000 | 818,000 | 300,000 | 1,100,000 |
Modified substandard commercial loans, total recorded investment | 1,000,000 | 1,200,000 | 1,000,000 | 1,200,000 |
Modified substandard consumer loans, total recorded investment | 12,000,000 | 16,000,000 | 12,000,000 | 16,000,000 |
Loan Modifications on Nonacrrual status | 3,000,000 | 2,200,000 | 3,300,000 | 8,000,000 |
Loan past due period before entering default status |  |  | 30 days |  |
Loans modified during period | 6,500,000 | 14,900,000 | 7,600,000 | 17,000,000 |
Financing Receivable With No Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 89,100,000 |  | 96,900,000
Financing Receivable With A Related Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | 7,700,000 |  | 8,200,000
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Allowance for loan losses individually evaluated for impairment | 703,000 |  | 703,000 |  | 1,540,000
Accruing [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans modified during period | 421,000 | 110,000 | 1,100,000 | 110,000 |
Nonaccrual [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Loans modified during period | $ 6,100,000 | $ 14,800,000 | $ 6,500,000 | $ 16,900,000 |

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