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Fair Value of Financial Instruments - Schedule of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value $ 204,719 $ 204,966
Residential [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 138,504 141,684
Commercial [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 45,993 35,944
Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 15,358 16,914
Obligations of U.S. Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 3,996 6,364
Recurring Fair Value Measurements [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 4 68
Recurring Fair Value Measurements [Member] | U.S. Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 80 4,060
Recurring Fair Value Measurements [Member] | Residential [Member] | Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 138,504 141,684
Recurring Fair Value Measurements [Member] | Commercial [Member] | Mortgage-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 45,993 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]    
Investment securities available-for-sale, at fair value 15,358 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]    
Investment securities available-for-sale, at fair value 3,996 6,364
Recurring Fair Value Measurements [Member] | Corporate Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 788  
Recurring Fair Value Measurements [Member] | Level 2 [Member] | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 4 68
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]    
Investment securities available-for-sale, at fair value 80 4,060
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]    
Investment securities available-for-sale, at fair value 138,504 141,684
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]    
Investment securities available-for-sale, at fair value 45,993 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]    
Investment securities available-for-sale, at fair value 15,358 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]    
Investment securities available-for-sale, at fair value 3,996 $ 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]    
Investment securities available-for-sale, at fair value $ 788