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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in nonperforming loans | $ (3,200,000) |  |
Charge-offs | 3,646,000 | 10,476,000 |
Decrease in specific allowance for nonperforming loans | (1,700,000) |  |
Unfunded commitments related to nonperforming loans | 3,400,000 |  |
Off balance sheet reserve to nonperforming loans | 100,000 |  |
Loans held for sale | 0 |  |
Total gains or losses included in earnings | 0 | 126,000 |
Nonaccrual | 45,680,000 |  | 45,888,000
Recorded investment | 56,203,000 |  | 59,383,000
Troubled debt restructured loans decreased | 7,600,000 |  |
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 | 300,000 |  |
Loans with modifications to rate and payment due to reamortization | 200,000 | 475,000 |
Loans Held For Sale [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gains or losses included in earnings | 0 | 126,000 |
Gas Drilling Related Business in Louisiana [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment | 8,000,000 |  |
Western Pennsylvania Specialty Metal Processor [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 3,200,000 |  |
Non Accrual Loans [Member] | Local Energy Company [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 10,900,000 |  |
Non Accrual Loans [Member] | Western Pennsylvania Real Estate Developer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual | 2,400,000 |  |
Impaired Loan Receivable, Original Balance | 44,100,000 |  |
Total charge-offs recognized | 28,500,000 |  |
Loans Sold [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in nonperforming loans | 700,000 |  |
Nonaccrual Loans Paid Off [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in nonperforming loans | 6,900,000 |  |
Additions to Nonperforming Loans [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in nonperforming loans | 9,600,000 |  |
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 |  |
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 |  |
Nonaccrual Loans Paid Off [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Decrease In Troubled Debt Restructurings | 6,600,000 |  |
Western Pennsylvania Reals Estate Investor [Member] | Nonaccrual Loans Paid Off [Domain] |  |  |
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 [Domain] |  |  |
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 [Domain] |  |  |
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 [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in nonperforming loans | 600,000 |  |
Nonaccrual Commercial Loans [Member] | Additions to Nonperforming Loans [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in nonperforming loans | 8,000,000 |  |
Nonaccrual Consumer Loans [Member] | Additions to Nonperforming Loans [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in nonperforming loans | 1,100,000 |  |
Local Energy Company [Member] [Member] | Charge-offs [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs | 500,000 |  |
Western Pennsylvania [Member] | Charge-offs [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs | 600,000 |  |
Consumer Home Equity Loan [Member] | Charge-offs [Domain] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs | $ 400,000 |  |

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