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Fair Value Measurement - Carrying Amount and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financial Assets:        
Cash and due from financial institutions $ 35,561 $ 29,858 $ 34,186 $ 45,963
Securities available for sale 196,249 197,905    
Loans, net of allowance for loan losses 987,166 900,589    
Other securities 13,452 12,586    
Bank owned life insurance 20,104 19,637    
Financial Liabilities:        
Time deposits 211,049      
Short-term FHLB advances 0      
Long-term FHLB advances 17,500 22,500    
Securities sold under agreement to repurchase 25,040 21,613 $ 20,053  
Carrying Amount [Member]        
Financial Assets:        
Cash and due from financial institutions 35,561 29,858    
Securities available for sale 196,249 197,905    
Loans, held for sale 2,698 2,410    
Loans, net of allowance for loan losses 987,166 900,589    
Other securities 13,452 12,586    
Bank owned life insurance 20,104 19,637    
Accrued interest receivable 3,902 3,852    
Swap asset 1,962 1,721    
Financial Liabilities:        
Nonmaturing deposits 840,984 748,948    
Time deposits 211,049 219,970    
Short-term FHLB advances 53,700 42,700    
Long-term FHLB advances 17,500 22,500    
Securities sold under agreement to repurchase 25,040 21,613    
Subordinated debentures 29,427 29,427    
Accrued interest payable 120 126    
Swap liability 1,962 1,721    
Total Fair Value [Member]        
Financial Assets:        
Cash and due from financial institutions 35,561 29,858    
Securities available for sale 196,249 197,905    
Loans, held for sale 2,698 2,410    
Loans, net of allowance for loan losses 986,848 908,118    
Other securities 13,452 12,586    
Bank owned life insurance 20,104 19,637    
Accrued interest receivable 3,902 3,852    
Swap asset 1,962 1,721    
Financial Liabilities:        
Nonmaturing deposits 840,984 748,948    
Time deposits 212,006 221,263    
Short-term FHLB advances 52,906 42,700    
Long-term FHLB advances 17,687 22,699    
Securities sold under agreement to repurchase 25,040 21,613    
Subordinated debentures 25,572 24,688    
Accrued interest payable 120 126    
Swap liability 1,962 1,721    
(Level 1) [Member]        
Financial Assets:        
Cash and due from financial institutions 35,561 29,858    
Loans, held for sale 2,698 2,410    
Other securities 13,452 12,586    
Bank owned life insurance 20,104 19,637    
Accrued interest receivable 3,902 3,852    
Financial Liabilities:        
Nonmaturing deposits 840,984 748,948    
Short-term FHLB advances 52,906 42,700    
Securities sold under agreement to repurchase 25,040 21,613    
Accrued interest payable 120 126    
(Level 2) [Member]        
Financial Assets:        
Securities available for sale 196,249 197,905    
Swap asset 1,962 1,721    
Financial Liabilities:        
Swap liability 1,962 1,721    
(Level 3) [Member]        
Financial Assets:        
Loans, net of allowance for loan losses 986,848 908,118    
Financial Liabilities:        
Time deposits 212,006 221,263    
Long-term FHLB advances 17,687 22,699    
Subordinated debentures $ 25,572 $ 24,688