Quarterly report pursuant to Section 13 or 15(d)

Financial Assets And Liabilities Carried At Fair Value On Recurring Basis (Detail)

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Financial Assets And Liabilities Carried At Fair Value On Recurring Basis (Detail) (Fair Value Measurements Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets $ 237,072 $ 294,435
U S Treasury And Government [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 33,494 99,622
Mortgage Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 81,957 92,580
U S States And Political Subdivisions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 115,196 100,526
Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 5,935 1,081
Interest Rate Swap [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 490 617
Derivative liabilities 490 617
Interest Rate Cap [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets   9
Fair Value Inputs Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets 237,072 294,435
Fair Value Inputs Level 2 [Member] | U S Treasury And Government [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 33,494 99,622
Fair Value Inputs Level 2 [Member] | Mortgage Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 81,957 92,580
Fair Value Inputs Level 2 [Member] | U S States And Political Subdivisions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 115,196 100,526
Fair Value Inputs Level 2 [Member] | Corporate Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale securities 5,935 1,081
Fair Value Inputs Level 2 [Member] | Interest Rate Swap [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 490 617
Derivative liabilities 490 617
Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets   $ 9