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Loans - Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans net of deferred origination fees, costs and unearned income | $ 6,700,000 | $ 6,800,000 |
Overdrawn deposit account reclassified to loans | 3,000,000 | 3,600,000 |
Partial charge-offs on impaired loans | 105,100,000 | 103,800,000 |
Allowance for loans individually evaluated for impairment | 8,276,000 | 15,935,000 |
Recorded investment, related to loans | 28,800,000 | 52,700,000 |
Average balance of financing receivable, individually evaluated for impairment | 164,200,000 | 214,000,000 | 210,400,000
Recognized net reversal to interest income |  |  | 1,300,000
Loans 90 days past due and still accruing | 3,030,000 | 3,561,000 |
TDRs included in nonaccrual loan totals | 84,700,000 | 100,400,000 |
Nonaccrual TDRs considered current | 52,600,000 | 79,900,000 |
TDRs included in accruing loan totals | 29,900,000 | 28,700,000 |
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR | 5,000,000 | 4,000,000 |
Specific reserves related to troubled debt restructuring | 5,600,000 | 9,100,000 |
Additional specific reserves related to troubled debt restructuring | 2,300,000 |  |
Modified substandard commercial loans, total recorded investment | 800,000 |  |
Modified substandard consumer loans total recorded investment | 26,500,000 |  |
Troubled debt restructuring consumer discharged in bankruptcy not reaffirmed | 12,500,000 |  |
Nonaccrual loans not classified as TDRs at prior fiscal year end | 6,500,000 | 29,900,000 |
Recorded investment modified as TDRs | 8,879,000 | 32,462,000 |
Other real estate owned | 35,700,000 | 42,300,000 |
Park National Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recognized net reversal to interest income |  |  | 948,000
Vision Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recognized net reversal to interest income |  |  | 2,200,000
With no related allowance recorded |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial charge-offs on impaired loans | 96,900,000 | 83,700,000 |
With an allowance recorded |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial charge-offs on impaired loans | 8,200,000 | 20,100,000 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Allowance for loans individually evaluated for impairment | 0 | 0 |
Loans 90 days past due and still accruing | 888,000 | 893,000 |
Executive officers and directors |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans due from related party | 39,400,000 | 53,000,000 |
New loan made to related party | 4,400,000 | 4,900,000 |
Repayment of loans due from related party | 13,600,000 | 5,500,000 |
Executive officers and directors | Vision Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans due from related party |  | 4,400,000 |
Accruing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Aggregate amount of loans modified during period | 606,000 | 3,500,000 |
Nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Aggregate amount of loans modified during period | $ 8,300,000 | $ 29,000,000 |

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