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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | $ 25,028 | $ 14,767 | $ 13,679
Charge-offs | (159) | (465) | (776)
Recoveries | 942 | 614 | 829
Provision (Credit) | 830 | 10,112 | 1,035
Ending Balance | 26,641 | 25,028 | 14,767
Commercial and Agriculture [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 2,810 | 2,219 | 1,747
Charge-offs | (15) | (20) | (114)
Recoveries | 165 | 7 | 86
Provision (Credit) | (360) | 604 | 500
Ending Balance | 2,600 | 2,810 | 2,219
Commercial Real Estate Owner Occupied [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 4,057 | 2,541 | 1,962
Charge-offs |  | (148) | (161)
Recoveries | 7 | 259 | 289
Provision (Credit) | 400 | 1,405 | 451
Ending Balance | 4,464 | 4,057 | 2,541
Commercial Real Estate Non Owner Occupied [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 12,451 | 6,584 | 5,803
Recoveries | 395 | 48 | 102
Provision (Credit) | 1,014 | 5,819 | 679
Ending Balance | 13,860 | 12,451 | 6,584
Residential Real Estate [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 2,484 | 1,582 | 1,531
Charge-offs | (120) | (236) | (294)
Recoveries | 302 | 218 | 259
Provision (Credit) | (69) | 920 | 86
Ending Balance | 2,597 | 2,484 | 1,582
Real Estate Construction [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 2,439 | 1,250 | 1,046
Charge-offs |  |  | (24)
Recoveries | 1 | 4 | 3
Provision (Credit) | (630) | 1,185 | 225
Ending Balance | 1,810 | 2,439 | 1,250
Farm Real Estate [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 338 | 344 | 397
Recoveries | 12 | 13 | 5
Provision (Credit) | (63) | (19) | (58)
Ending Balance | 287 | 338 | 344
Consumer and Other [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 209 | 247 | 284
Charge-offs | (24) | (61) | (183)
Recoveries | 60 | 65 | 85
Provision (Credit) | (69) | (42) | 61
Ending Balance | 176 | 209 | 247
Unallocated [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 240 |  | 909
Provision (Credit) | 607 | 240 | $ (909)
Ending Balance | $ 847 | $ 240 |

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