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Commitments and Contingencies - Additional Information (Detail) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Undisbursed loan commitments $ 62,900,000  
Time deposits 287,077,000 $ 304,969,000
Outstanding borrowings 25,000,000 $ 23,000,000
Federal Home Loan Bank of Cincinnati [Member]    
Loss Contingencies [Line Items]    
Letters of credit 47,600,000  
Securities with a fair market value sold under agreements to repurchase from various customers 38,100,000  
Securities pledged to municipalities for deposits in excess of FDIC limits, market value 39,300,000  
Standby Letters of Credit [Member]    
Loss Contingencies [Line Items]    
Letters of credit 293,000  
Unused Home Equity Lines of Credit [Member]    
Loss Contingencies [Line Items]    
Lines of credit outstanding 33,100,000  
Personal Lines of Credit [Member]    
Loss Contingencies [Line Items]    
Lines of credit outstanding 20,500,000  
Loan Origination Commitments [Member]    
Loss Contingencies [Line Items]    
Outstanding commitments 48,400,000  
One Year [Member]    
Loss Contingencies [Line Items]    
Time deposits 40,900,000  
One Year [Member] | Minimum [Member]    
Loss Contingencies [Line Items]    
Certificates of deposits 100,000  
One Year [Member] | Maximum [Member]    
Loss Contingencies [Line Items]    
Certificates of deposits 250,000  
One Year Or Less [Member]    
Loss Contingencies [Line Items]    
Time deposits 61,900,000  
One Year Or Less [Member] | Minimum [Member]    
Loss Contingencies [Line Items]    
Certificates of deposits $ 250,000