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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance $ 14,767,000 $ 13,679,000 $ 13,134,000
Charge-offs (465,000) (776,000) (903,000)
Recoveries 614,000 829,000 668,000
Provision (Credit) 10,112,000 1,035,000 780,000
Ending Balance 25,028,000 14,767,000 13,679,000
Commercial and Agriculture [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 2,219,000 1,747,000 1,562,000
Charge-offs (20,000) (114,000) (249,000)
Recoveries 7,000 86,000 169,000
Provision (Credit) 604,000 500,000 265,000
Ending Balance 2,810,000 2,219,000 1,747,000
Commercial Real Estate Owner Occupied [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 2,541,000 1,962,000 2,043,000
Charge-offs (148,000) (161,000) (193,000)
Recoveries 259,000 289,000 158,000
Provision (Credit) 1,405,000 451,000 (46,000)
Ending Balance 4,057,000 2,541,000 1,962,000
Commercial Real Estate Non Owner Occupied [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 6,584,000 5,803,000 5,307,000
Charge-offs     (153,000)
Recoveries 48,000 102,000 28,000
Provision (Credit) 5,819,000 679,000 621,000
Ending Balance 12,451,000 6,584,000 5,803,000
Residential Real Estate [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 1,582,000 1,531,000 1,910,000
Charge-offs (236,000) (294,000) (105,000)
Recoveries 218,000 259,000 208,000
Provision (Credit) 920,000 86,000 (482,000)
Ending Balance 2,484,000 1,582,000 1,531,000
Real Estate Construction [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 1,250,000 1,046,000 834,000
Charge-offs   (24,000)  
Recoveries 4,000 3,000  
Provision (Credit) 1,185,000 225,000 212,000
Ending Balance 2,439,000 1,250,000 1,046,000
Farm Real Estate [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 344,000 397,000 430,000
Recoveries 13,000 5,000 5,000
Provision (Credit) (19,000) (58,000) (38,000)
Ending Balance 338,000 344,000 397,000
Consumer and Other [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance 247,000 284,000 290,000
Charge-offs (61,000) (183,000) (203,000)
Recoveries 65,000 85,000 100,000
Provision (Credit) (42,000) 61,000 97,000
Ending Balance 209,000 247,000 284,000
Unallocated [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Beginning balance   909,000 758,000
Provision (Credit) 240,000 $ (909,000) 151,000
Ending Balance $ 240,000   $ 909,000