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Fair Value of Financial Instruments - Schedule of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 14 $ 68
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 80 4,060
Recurring Fair Value Measurements [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 14 68
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 138,769 141,684
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 45,147 35,944
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 15,461 16,914
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 2,000 6,364
Recurring Fair Value Measurements [Member] | Corporate Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 790  
Recurring Fair Value Measurements [Member] | Level 2 [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 80 4,060
Recurring Fair Value Measurements [Member] | Level 2 [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 14 68
Recurring Fair Value Measurements [Member] | Level 2 [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 138,769 141,684
Recurring Fair Value Measurements [Member] | Level 2 [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 45,147 35,944
Recurring Fair Value Measurements [Member] | Level 2 [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 15,461 16,914
Recurring Fair Value Measurements [Member] | Level 2 [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 2,000 $ 6,364
Recurring Fair Value Measurements [Member] | Level 2 [Member] | Corporate Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 790