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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Two Commercial Real Estate Loans [Member]
Mar. 31, 2013
Western Pennsylvania Non-Profit Healthcare Facility [Member]
Mar. 31, 2013
Western Pennsylvania Student Housing Project [Member]
Mar. 31, 2013
Consumer Loan [Member]
Mar. 31, 2013
Construction Loan in Florida [Member]
Mar. 31, 2012
Western Pennsylvania Non-Profit Corporation [Member]
Mar. 31, 2013
Nonaccrual Consumer Loans [Member]
Mar. 31, 2013
Accruing Loans [Member]
Hotel Resort Syndication Loan in the State of Washington [Member]
Mar. 31, 2013
Non Accrual Loans [Member]
Mar. 31, 2013
Impaired Loans [Member]
Mar. 31, 2012
Impaired Loans [Member]
Mar. 31, 2013
Impaired Loans [Member]
Reserve for off balance sheet activities [Member]
Mar. 31, 2013
Impaired Loans [Member]
Real Estate Developer In Eastern Pennsylvania [Member]
Mar. 31, 2013
Impaired Loans [Member]
Commercial Real Estate Loan in Nevada [Member]
Dec. 31, 2010
Impaired Loans [Member]
Western Pennsylvania Real Estate Developer [Member]
Mar. 31, 2013
Impaired Loans [Member]
Western Pennsylvania Real Estate Developer [Member]
Mar. 31, 2013
Impaired Loans [Member]
Western Pennsylvania [Member]
Mar. 31, 2013
Impaired Loans [Member]
Construction Loan in Florida [Member]
Mar. 31, 2013
Loans Held For Sale [Member]
Mar. 31, 2012
Loans Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]                                              
Increase (decrease) in nonperforming loans                     $ 3,800,000 $ 2,700,000 $ (29,300,000)     $ (17,200,000) $ (2,500,000)            
Charge-offs 10,476,000 4,992,000   5,300,000 2,800,000 2,500,000                           2,800,000      
Nonaccrual loans                   1,100,000                          
Decrease in specific allowance for nonperforming loans                         5,100,000                    
Unfunded commitments related to nonperforming loans                         1,200,000                    
Off balance sheet reserve to nonperforming loans                             200,000                
Loans held for sale 0                                            
Total gains or losses included in earnings 126,000 1,307,000                                       126,000 1,768,000
Nonaccrual 64,141,000   94,518,000                   18,700,000             3,500,000      
Non Accrual Status Of Loans After Number Of Days Past Due             150 days                                
Financing receivable recorded investment nonaccrual status remaining portion                                     44,100,000   17,300,000    
Principal payment of nonaccrual loans                                   8,000,000          
Nonaccrual loans charge off                 3,200,000                 15,400,000          
Impaired loans under nonperforming status               20,800,000                         3,500,000    
Troubled debt restructured loans decreased                         17,300,000                    
Commitments related to troubled debt restructured loans increased                         (500,000)                    
Loans with modifications to rate and payment due to reamortization                         $ 500,000 $ 97,000