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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale $ 284,628 $ 324,509
U.S. Treasury [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 25,331 25,272
U.S. Government agency [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 147,146 172,972
Mortgage-backed securities [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 33,182 44,792
State and local governments [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 78,969 81,473
Level 1 [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 25,331 25,272
Level 1 [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 25,331 25,272
Level 1 [Member] | U.S. Treasury [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 25,331 25,272
Level 2 [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 251,222 288,891
Level 2 [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 251,223 288,891
Level 2 [Member] | U.S. Government agency [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 147,146 172,972
Level 2 [Member] | Mortgage-backed securities [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 33,182 44,792
Level 2 [Member] | State and local governments [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 70,895 71,127
Level 3 [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 8,074 10,346
Level 3 [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 8,074 10,346
Level 3 [Member] | State and local governments [Member] | Fair Value on a Recurring Basis [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale $ 8,074 $ 10,346