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Fair Value of Financial Instruments - Schedule of Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Recurring Fair Value Measurements [Member] | U.S. Treasury Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 3,946 $ 3,827
Recurring Fair Value Measurements [Member] | Other Assets - Derivatives [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 105  
Recurring Fair Value Measurements [Member] | Residential [Member] | Mortgage-Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 123,767 83,434
Recurring Fair Value Measurements [Member] | Commercial [Member] | Mortgage-Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 34,346 30,465
Recurring Fair Value Measurements [Member] | Obligations of States and Political Subdivisions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 16,899 17,027
Recurring Fair Value Measurements [Member] | Obligations of U.S. Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 388 1,001
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 105  
Level 2 [Member] | Recurring Fair Value Measurements [Member] | U.S. Treasury Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 3,946 3,827
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Other Assets - Derivatives [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 105  
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Residential [Member] | Mortgage-Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 123,767 83,434
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Commercial [Member] | Mortgage-Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 34,346 30,465
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Obligations of States and Political Subdivisions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 16,899 17,027
Level 2 [Member] | Recurring Fair Value Measurements [Member] | Obligations of U.S. Government Sponsored Agencies [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 388 $ 1,001