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Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | $ 5,583,000 | $ 4,670,000 | $ 32,195,000 | $ 13,411,000 |
Transfer to Other Real Estate |  |  | 8,847,000 | 4,053,000 |
Loans held for sale | 0 |  | 0 |  |
Total gains or losses included in earnings | 242,000 | 0 | 625,000 | 2,409,000 |
Nonaccrual | 59,929,000 |  | 59,929,000 |  | 94,518,000
Two Commercial Real Estate Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 21,200,000 |  |
Western Pennsylvania Non-Profit Healthcare Facility [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 2,800,000 |  |
Western Pennsylvania Student Housing Project [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 3,000,000 |  |
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 |  |
Nonaccrual Commercial Loans [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 32,700,000 |  | 32,700,000 |  |
Western Pennsylvania Real Estate Developer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 13,100,000 |  |
Nonaccrual Consumer Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 2,700,000 |  | 2,700,000 |  |
Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 2,800,000 |  | 2,800,000 |  |
Accruing Loans [Member] | Hotel Resort Syndication Loan in the State of Washington [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 3,800,000 |  |
Accruing Loans [Member] | Western Pennsylvania Excavation Company [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 2,300,000 |  |
Non Accrual Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | 39,800,000 |  |
Impaired Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | (36,300,000) |  |
Decrease in specific allowance for nonperforming loans |  |  | 9,500,000 |  |
Unfunded commitments related to nonperforming loans | 500,000 |  | 500,000 |  |
Troubled debt restructured loans decreased |  |  | 34,900,000 |  |
Commitments related to troubled debt restructured loans increased |  |  | 1,700,000 |  |
Loans with modifications to rate and payment due to reamortization | 0 | 700,000 | 600,000 | 801,000 |
Impaired Loans [Member] | Reserve for off balance sheet activities [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Off balance sheet reserve to nonperforming loans | 200,000 |  | 200,000 |  |
Impaired Loans [Member] | Real Estate Developer In Eastern Pennsylvania [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | (17,200,000) |  |
Impaired Loans [Member] | Commercial Real Estate Loan in Nevada [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | (2,500,000) |  |
Impaired Loans [Member] | Western Pennsylvania Real Estate Developer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable recorded investment nonaccrual status remaining portion | 44,100,000 |  | 44,100,000 |  |
Impaired Loans [Member] | Western Pennsylvania [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 2,800,000 |  |  |  |
Nonaccrual | 3,400,000 |  | 3,400,000 |  |
Impaired Loans [Member] | Construction Loan in Florida [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in nonperforming loans |  |  | (3,500,000) |  |
Loans Held For Sale [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total gains or losses included in earnings | 242,000 | 0 | 625,000 | 2,870,000 |
Local Energy Company [Member] [Member] | Nonaccrual Commercial Loans [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 12,700,000 |  | 12,700,000 |  |
Nonaccrual | 12,700,000 |  | 12,700,000 |  |
Western Pennsylvania Specialty Metal Processor [Member] | Nonaccrual Commercial Loans [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 3,600,000 |  | 3,600,000 |  |
Nonaccrual | 3,500,000 |  | 3,500,000 |  |
Western Pennsylvania Glass Manufacturer [Member] [Member] | Nonaccrual Commercial Loans [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 3,100,000 |  | 3,100,000 |  |
Western Pennsylvania Reals Estate Manager [Member] | Nonaccrual Commercial Loans [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 7,600,000 |  | 7,600,000 |  |
Western Pennsylvania Real Estate Developer [Member] | Nonaccrual Commercial Loans [Member] [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  | 500,000 |  |
Transfer to Other Real Estate |  |  | 4,800,000 |  |
Nonaccrual loans | $ 5,700,000 |  | $ 5,700,000 |  |

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- Definition The aggregate carrying amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market, or elected fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 35 -Paragraph 49 -URI http://asc.fasb.org/extlink&oid=16382521&loc=d3e3084-111518 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490209&loc=d3e48214-111002 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 65 -Paragraph 4, 5, 6, 7, 9, 12, 28, 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph h -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 65 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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