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Fair Value of Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Financial Assets:        
Cash and Cash Equivalents $ 31,498 $ 22,018 $ 31,218 $ 24,295
Interest-bearing time deposits 1,915      
Securities-available-for-sale 224,473 235,115    
Other Securities 3,717 3,717    
Loans, net 732,070 679,821    
Financial Liabilities:        
Non-interest bearing Deposits 176,180 171,112    
Time Deposits 212,042 184,285    
Total deposits 838,101 771,339    
Fed Funds purchased and Securities sold under agreements to repurchase 59,487 78,815    
Federal Home Loan Bank advances 10,000 10,000    
Carrying Amount [Member]        
Financial Assets:        
Cash and Cash Equivalents 31,498 22,018    
Interest-bearing time deposits 1,915      
Securities-available-for-sale 224,473 235,115    
Other Securities 3,717 3,717    
Loans, net 732,070 679,821    
Interest receivable 4,430 3,589    
Financial Liabilities:        
Interest bearing Deposits 449,879 415,942    
Non-interest bearing Deposits 176,180 171,112    
Time Deposits 212,042 184,285    
Total deposits 838,101 771,339    
Fed Funds purchased and Securities sold under agreements to repurchase 59,487 78,815    
Federal Home Loan Bank advances 10,000 10,000    
Interest payable 228 185    
Fair Value [Member]        
Financial Assets:        
Cash and Cash Equivalents 31,498 22,018    
Interest-bearing time deposits 1,915      
Securities-available-for-sale 224,473 235,115    
Other Securities 3,717 3,717    
Loans, net 735,456 683,332    
Interest receivable 4,430 3,589    
Financial Liabilities:        
Interest bearing Deposits 449,879 415,942    
Non-interest bearing Deposits 176,180 171,112    
Time Deposits 212,254 184,308    
Total deposits 838,313 771,362    
Fed Funds purchased and Securities sold under agreements to repurchase 59,487 78,815    
Federal Home Loan Bank advances 10,041 9,986    
Interest payable 228 185    
Level 1 [Member]        
Financial Assets:        
Cash and Cash Equivalents 31,498 22,018    
Securities-available-for-sale 31,059 38,505    
Level 2 [Member]        
Financial Assets:        
Interest-bearing time deposits 1,915      
Securities-available-for-sale 191,873 189,258    
Financial Liabilities:        
Non-interest bearing Deposits 176,180 171,112    
Total deposits 176,180 171,112    
Level 3 [Member]        
Financial Assets:        
Securities-available-for-sale 1,541 7,352    
Other Securities 3,717 3,717    
Loans, net 735,456 683,332    
Interest receivable 4,430 3,589    
Financial Liabilities:        
Interest bearing Deposits 449,879 415,942    
Time Deposits 212,254 184,308    
Total deposits 662,133 600,250    
Fed Funds purchased and Securities sold under agreements to repurchase 59,487 78,815    
Federal Home Loan Bank advances 10,041 9,986    
Interest payable $ 228 $ 185