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Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financial Assets:        
Cash and due from financial institutions $ 40,519 $ 36,695 $ 35,561 $ 29,858
Securities available for sale 231,062 195,864    
Loans, net of allowance for loan losses 1,151,527 1,042,201    
Other securities 14,247 14,055    
Bank owned life insurance 25,125 24,552    
Accrued interest receivable 4,488 3,854    
Financial Liabilities:        
Time deposits 223,902      
Short-term FHLB advances 10,000      
Long-term FHLB advances 15,000 17,500    
Securities sold under agreement to repurchase 21,755 28,925 $ 25,040  
Carrying Amount [Member]        
Financial Assets:        
Cash and due from financial institutions 40,519 36,695    
Securities available for sale 231,062 195,864    
Loans, held for sale 2,197 2,268    
Loans, net of allowance for loan losses 1,151,527 1,042,201    
Other securities 14,247 14,055    
Bank owned life insurance 25,125 24,552    
Accrued interest receivable 4,336 3,854    
Fair value swap asset 1,560 1,839    
Financial Liabilities:        
Nonmaturing deposits 981,021 913,677    
Time deposits 223,902 207,426    
Short-term FHLB advances 56,900 31,000    
Long-term FHLB advances 15,000 17,500    
Securities sold under agreement to repurchase 21,755 28,925    
Subordinated debentures 29,427 29,427    
Accrued interest payable 410 181    
Swap liability 1,560 1,839    
Total Fair Value [Member]        
Financial Assets:        
Cash and due from financial institutions 40,519 36,695    
Securities available for sale 231,062 195,864    
Loans, held for sale 2,197 2,268    
Loans, net of allowance for loan losses 1,146,969 1,047,329    
Other securities 14,247 14,055    
Bank owned life insurance 25,125 24,552    
Accrued interest receivable 4,336 3,854    
Fair value swap asset 1,560 1,839    
Financial Liabilities:        
Nonmaturing deposits 981,021 913,677    
Time deposits 223,626 207,784    
Short-term FHLB advances 56,900 31,000    
Long-term FHLB advances 14,964 17,553    
Securities sold under agreement to repurchase 21,755 28,925    
Subordinated debentures 31,052 27,414    
Accrued interest payable 410 181    
Swap liability 1,560 1,839    
(Level 1) [Member]        
Financial Assets:        
Cash and due from financial institutions 40,519 36,695    
Loans, held for sale 2,197 2,268    
Other securities 14,247 14,055    
Bank owned life insurance 25,125 24,552    
Accrued interest receivable 4,336 3,854    
Financial Liabilities:        
Nonmaturing deposits 981,021 913,677    
Short-term FHLB advances 56,900 31,000    
Securities sold under agreement to repurchase 21,755 28,925    
Accrued interest payable 410 181    
(Level 2) [Member]        
Financial Assets:        
Securities available for sale 231,062 195,864    
Fair value swap asset 1,560 1,839    
Financial Liabilities:        
Swap liability 1,560 1,839    
(Level 3) [Member]        
Financial Assets:        
Loans, net of allowance for loan losses 1,146,969 1,047,329    
Financial Liabilities:        
Time deposits 223,626 207,784    
Long-term FHLB advances 14,964 17,553    
Subordinated debentures $ 31,052 $ 27,414