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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans increased | $ 170,700,000 |  | $ 170,700,000 |  |
Percentage of loans decreased | 4.00% |  | 4.00% |  |
Charge-offs | 4,670,000 | 10,346,000 | 13,411,000 | 30,148,000 |
Nonperforming loans paid off | 900,000 |  |  |  |
Nonprofit loan, current balance | 3,900,000 |  | 3,900,000 |  |
Loans held for sale | 0 |  | 0 |  | 13,412,000
Nonaccrual | 86,730,000 |  | 86,730,000 |  | 78,476,000
Financing receivable recorded investment nonaccrual status remaining portion | 20,800,000 |  | 20,800,000 |  |
Loans with modifications to rate and payment due to reamortization | 700,000 | 0 |  |  |
Minimum days required for conversion of trouble debt to be in default |  |  | 90 days |  |
Construction Loan in Florida [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  |  | 10,800,000 |
Real estate construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 1,400,000 | 4,300,000 |
Commercial loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 1,200,000 | 2,000,000 |
Central pennsylvania [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  |  | 5,200,000 |
Nonaccrual Consumer Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 4,800,000 |  | 4,800,000 |  |
Residential Real Estate Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 4,700,000 |  | 4,700,000 |  |
Nonaccrual loans status |  |  | 150 |  |
Criticized Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans increased | 23,000,000 |  | 23,000,000 |  |
Percentage of loans decreased | 8.00% |  | 8.00% |  |
Loans designated as substandard or doubtful | 269,000,000 |  | 269,000,000 |  |
Percentage of loan portfolio |  |  | 6.00% |  |
Increase in nonperforming loan |  |  | 10,300,000 |  |
Increase in specific reserves due to troubled debt restructuring |  |  | 3,200,000 |  |
Accruing Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans increased | 10,200,000 |  | 10,200,000 |  |
Percentage of loans decreased | 29.00% |  | 29.00% |  |
Non Accrual Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans increased | 8,300,000 |  | 8,300,000 |  |
Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase in nonperforming loan |  |  | 4,900,000 |  |
Nonperforming loans | 93,900,000 |  | 93,900,000 |  | 98,800,000
Increase decrease in nonperforming loans | 11,300,000 |  | 10,300,000 |  |
Decrease in specific allowance for nonperforming loans |  |  | 300,000 |  |
Unfunded commitments related to nonperforming loans | 5,100,000 |  | 5,100,000 |  |
Loans held for sale | 2,900,000 |  | 2,900,000 |  | 13,400,000
Nonaccrual | 19,300,000 |  | 19,300,000 |  |
Troubled debt restructured loans decreased |  |  | 13,100,000 |  |
Commitments related to troubled debt restructured loans increased |  |  | 11,300,000 |  |
Loans with modifications to rate and payment due to reamortization |  |  | 800,000 | 300,000 |
Impaired Loans [Member] | Reserve for off balance sheet activities [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Off balance sheet reserve to nonperforming loans | 44,000 |  | 44,000 |  |
Impaired Loans [Member] | Waste Management Company In Pennsylvania [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase in nonperforming loan |  |  | 11,300,000 |  |
Impaired Loans [Member] | Western Pennsylvania [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired loans under nonperforming status |  |  | 2,800,000 |  |
Nonperforming loans paid off | 2,200,000 |  |  |  |
Financing receivable recorded investment nonaccrual status remaining portion | 44,100,000 |  | 44,100,000 |  |
Principal payment of nonaccrual loans |  |  | 8,000,000 |  |
Nonaccrual loans charge off |  |  | 15,400,000 |  |
Impaired Loans [Member] | Construction Loan in Florida [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 4,300,000 |  | 4,300,000 |  |
Financing receivable recorded investment nonaccrual status remaining portion | 16,500,000 |  | 16,500,000 |  |
Impaired Loans [Member] | Commercial real estate loan for retail development in Western Pennsylvania [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired loans under nonperforming status |  |  | 6,700,000 |  |
Nonaccrual | 3,900,000 |  | 3,900,000 |  |
Impaired Loans [Member] | Commercial real estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonperforming commercial real estate loans |  |  | 4,900,000 |  |
Impaired Loans [Member] | Medical Equipment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Impaired loans under nonperforming status |  |  | 2,500,000 |  |
Impaired Loans [Member] | Eastern Pennsylvania [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 16,000,000 |  | 16,000,000 |  |
Nonaccrual loans charge off |  |  | $ 4,200,000 |  |

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