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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
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