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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 13,679 $ 13,134 $ 13,305
Charge-offs (776) (903) (942)
Recoveries 829 668 771
Provision (Credit) 1,035 780  
Ending Balance 14,767 13,679 13,134
Commercial and Agriculture [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 1,747 1,562 2,018
Charge-offs (114) (249) (11)
Recoveries 86 169 372
Provision (Credit) 500 265 (817)
Ending Balance 2,219 1,747 1,562
Commercial Real Estate Owner Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 1,962 2,043 2,171
Charge-offs (161) (193) (328)
Recoveries 289 158 69
Provision (Credit) 451 (46) 131
Ending Balance 2,541 1,962 2,043
Commercial Real Estate Non Owner Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 5,803 5,307 4,606
Charge-offs   (153) (38)
Recoveries 102 28 46
Provision (Credit) 679 621 693
Ending Balance 6,584 5,803 5,307
Residential Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 1,531 1,910 3,089
Charge-offs (294) (105) (400)
Recoveries 259 208 194
Provision (Credit) 86 (482) (973)
Ending Balance 1,582 1,531 1,910
Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 1,046 834 420
Charge-offs (24)    
Recoveries 3   44
Provision (Credit) 225 212 370
Ending Balance 1,250 1,046 834
Farm Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 397 430 442
Recoveries 5 5 3
Provision (Credit) (58) (38) (15)
Ending Balance 344 397 430
Consumer and Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 284 290 314
Charge-offs (183) (203) (165)
Recoveries 85 100 43
Provision (Credit) 61 97 98
Ending Balance 247 284 290
Unallocated [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 909 758 245
Provision (Credit) $ (909) 151 513
Ending Balance   $ 909 $ 758