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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | $ (14,100,000) |  |
Allowance for Loan and Lease Losses Write-offs, Net |  |  | (12,100,000) |  |
Charge-offs | 2,880,000 | 5,583,000 | 14,629,000 | 32,195,000 |
Decrease in specific allowance for nonperforming loans |  |  | 4,200,000 |  |
Unfunded commitments related to nonperforming loans | 400,000 |  | 400,000 |  |
Off balance sheet reserve to nonperforming loans | 0 |  | 0 |  |
Loans held for sale | 1,305,000 |  | 1,305,000 |  | 0
Total gains or losses included in earnings | 0 | 242,000 | 77,000 | 625,000 |
Nonaccrual | 34,093,000 |  | 34,093,000 |  | 45,888,000
Recorded investment | 45,257,000 |  | 45,257,000 |  | 59,383,000
Troubled debt restructured loans decreased |  |  | 12,500,000 |  |
Loans to individuals [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due |  |  | 150 days |  |
Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commitments related to troubled debt restructured loans increased |  |  | 500,000 |  |
Loans with modifications to rate and payment due to reamortization | 100,000 | 100,000 | 500,000 | 588,000 |
Loans Held For Sale [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total gains or losses included in earnings | 0 | 242,000 | 77,000 | 625,000 |
Audio Visual Equipment Distributer [Member] | Nonaccrual Commercial Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Recorded investment | 3,900,000 |  | 3,900,000 |  |
Western Pennsylvania Specialty Metal Processor [Member] | Nonaccrual Commercial Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 3,000,000 |  | 3,000,000 |  |
Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 10,600,000 |  | 10,600,000 |  |
Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 12,500,000 |  |
Loans Sold [Domain] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 3,000,000 |  |
Additions to Nonperforming Loans [Domain] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 19,800,000 |  |
2012 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 2,700,000 |  | 2,700,000 |  |
2013 Troubled Debt Restructuring [Member] | Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 300,000 |  | 300,000 |  |
Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Decrease In Troubled Debt Restructurings |  |  | 11,300,000 |  |
Western Pennsylvania Funeral Home [Member] | Additions to Nonperforming Loans [Domain] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 700,000 |  |
Western Pennsylvania Personal Care Facility [Member] | Additions to Nonperforming Loans [Domain] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 700,000 |  |
Audio Visual Equipment Distributer [Member] | Additions to Nonperforming Loans [Domain] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 4,300,000 |  |
Residential Real Estate [Member] | Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 900,000 |  |
Western Pennsylvania Real Estate Developer [Member] | Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 4,700,000 |  |
Western Pennsylvania Reals Estate Investor [Member] | Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 300,000 |  |
Western Pennsylvania Non-Profit Organization [Member] | Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 3,100,000 |  |
Western Pennsylvania Reals Estate Manager [Member] | Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 2,900,000 |  |
Western Pennsylvania Glass Manufacturer [Member] [Member] | Nonaccrual Loans Paid Off [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 600,000 |  |
Nonaccrual Consumer Loans [Member] | Additions to Nonperforming Loans [Domain] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 3,200,000 |  |
Gas Drilling Related Business in Louisiana [Member] | Charge Offs [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 5,800,000 |  |
Western Pennsylvania [Member] | Charge Offs [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 600,000 |  |
Local Energy Company [Member] [Member] | Charge Offs [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | $ 500,000 |  |

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