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Financial Assets and Liabilities at Dates Indicated that Were Accounted for or Disclosed at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) $ 29,033 $ 36,149
Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 29,033 36,149
Fair Value, Measurements, Recurring | U.S. Government Agencies
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 174,687 156,428
Fair Value, Measurements, Recurring | State and Municipal
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 167,159 174,491
Fair Value, Measurements, Recurring | Mortgage-Backed
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 492,420 490,479
Fair Value, Measurements, Recurring | Corporate Debt
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 2,006 1,996
Fair Value, Measurements, Recurring | Trust Preferred
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 1,445 1,465
Fair Value, Measurements, Recurring | Marketable Equity Securities
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 723 723
Fair Value, Measurements, Recurring | Interest Rate Swap Agreements
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 1,974 1,280
Other liabilities (1,974) (1,280)
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 29,033 36,149
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Government Agencies
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 174,687 156,428
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | State and Municipal
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 167,159 174,491
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage-Backed
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 492,420 490,479
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Debt
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 2,006 1,996
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Marketable Equity Securities
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) 723 723
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Interest Rate Swap Agreements
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets 1,974 1,280
Other liabilities (1,974) (1,280)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Trust Preferred
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Residential mortgage loans held for sale (at fair value) $ 1,445 $ 1,465