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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 9 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Water Treatment Plant [Member] | Dec. 31, 2012 Gas Well Servicing Operation [Member] | Dec. 31, 2011 Commercial real estate loans [Member] | Dec. 31, 2012 Troubled debt restructured loans [Member] | Dec. 31, 2012 Troubled debt restructured loans [Member] | Dec. 31, 2011 Troubled debt restructured loans [Member] | Dec. 31, 2012 Commercial real estate [Member] | Dec. 31, 2012 Commercial real estate [Member] Gas Well Servicing Operation [Member] | Dec. 31, 2011 Loans Held for Sale [Member] | Sep. 30, 2012 Commercial real estate loan for retail development in western Pennsylvania [Member] | Jun. 30, 2012 Impaired Loans [Member] | Dec. 31, 2012 Impaired Loans [Member] D | Dec. 31, 2011 Impaired Loans [Member] | Dec. 31, 2012 Impaired Loans [Member] Real Estate [Member] | Dec. 31, 2012 Impaired Loans [Member] Western Pennsylvania (Member] | Dec. 31, 2012 Impaired Loans [Member] Eastern Pennsylvania [Member] | Dec. 31, 2012 Impaired Loans [Member] Reserve for off balance sheet activities [Member] | Dec. 31, 2011 Impaired Loans [Member] Reserve for off balance sheet activities [Member] | Dec. 31, 2012 Impaired Loans [Member] Commercial real estate [Member] | Dec. 31, 2011 Impaired Loans [Member] Loans Held for Sale [Member] | Dec. 31, 2012 Impaired Loans [Member] Commercial real estate loan for retail development in western Pennsylvania [Member] | Dec. 31, 2012 Impaired Loans [Member] Washington [Member] | Dec. 31, 2012 Impaired Loans [Member] Medical Equipment [Member] | Dec. 31, 2012 Impaired Loans [Member] Real Estate Secured Loan to a Hotel Resort Syndication in Washington [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge-offs | $ 16,969,000 | $ 68,293,000 | $ 75,309,000 |  |  |  |  |  | $ 5,600,000 |  |  | $ 9,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio | 91.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonperforming loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,400,000 |  |  |  |
Decrease in nonperforming loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,300,000 |  |  |  |  |  |  |  |  |  |  |
Increase decrease in nonperforming loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans under nonperforming status |  |  |  |  |  |  |  |  |  |  |  |  | 6,500,000 |  | 2,800,000 |  |  | 4,900,000 |  |  |  | 3,800,000 |  | 6,500,000 | 4,600,000 | 2,500,000 |
Nonaccrual loans |  |  |  | 2,800,000 | 3,700,000 |  |  |  |  | 3,300,000 | 17,000,000 |  |  |  | 6,500,000 |  | 6,700,000 |  |  |  |  | 3,300,000 |  |  |  |  |
Nonaccrual loans status |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitments related to nonperforming loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 | 6,700,000 |  |  |  |  |  |  |  |  |  |  |
Off balance sheet reserve to nonperforming loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 200,000 |  |  |  |  |  |
Nonaccrual | 94,518,000 | 78,476,000 |  |  |  |  |  |  |  |  |  |  |  |  | 19,100,000 |  |  | 4,900,000 | 15,700,000 |  |  |  |  |  |  |  | 4,600,000
Financing receivable recorded investment nonaccrual status remaining portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,100,000 |  |  |  |  |  |  |  |  |
Principal payment of nonaccrual loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |
Nonaccrual loans charge off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,400,000 | 4,200,000 |  |  |  |  |  |  |  |
Loan maturity extension |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans held for sale | 0 | 13,412,000 |  |  |  | 2,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructured Loan |  |  |  |  |  |  |  |  | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans outstanding |  |  |  |  |  |  | 17,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt forgiveness granted | 15,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans with modification to rate and payment due to amortization | 4,700,000 | 25,200,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum days required for conversion of trouble debt to be in default | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans transferred to loans held for sale |  |  |  |  |  |  |  | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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