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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 17,283 |  |  |  | $ 14,313 | $ 17,283 | $ 14,313 |
Charge Offs |  |  |  |  |  |  |  |  | (827) | (1,332) | $ (720)
Recoveries |  |  |  |  |  |  |  |  | 298 | 458 | 183
Provision (Credit) | $ 755 | $ 1,637 | $ 1,628 | 580 | $ 444 | $ 659 | $ 641 | 1,700 | 4,600 | 3,444 | 6,981
Other Non-interest expense related to unfunded |  |  |  |  |  |  |  |  | 221 | 400 |
Ending Balance | 21,575 |  |  |  | 17,283 |  |  |  | 21,575 | 17,283 | 14,313
Ending balance: individually evaluated for impairment | 1,996 |  |  |  | 2,184 |  |  |  | 1,996 | 2,184 |
Ending balance: collectively evaluated for impairment | 19,579 |  |  |  | 15,099 |  |  |  | 19,579 | 15,099 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 37 |  |  |  | 0 | 37 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 2,356,387 |  |  |  | 1,857,419 |  |  |  | 2,356,387 | 1,857,419 |
Ending balance: individually evaluated for impairment | 8,857 |  |  |  | 11,939 |  |  |  | 8,857 | 11,939 |
Ending balance: collectively evaluated for impairment | 2,346,871 |  |  |  | 1,844,031 |  |  |  | 2,346,871 | 1,844,031 |
Ending balance: loans acquired with deteriorated credit quality | 659 |  |  |  | 1,449 |  |  |  | 659 | 1,449 |
Consumer Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 857 |  |  |  | 633 | 857 | 633 |
Charge Offs |  |  |  |  |  |  |  |  |  | (19) |
Recoveries |  |  |  |  |  |  |  |  | 20 | 13 |
Provision (Credit) |  |  |  |  |  |  |  |  | 121 | 230 |
Ending Balance | 998 |  |  |  | 857 |  |  |  | 998 | 857 | 633
Ending balance: individually evaluated for impairment | 6 |  |  |  |  |  |  |  | 6 |  |
Ending balance: collectively evaluated for impairment | 992 |  |  |  | 857 |  |  |  | 992 | 857 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 37 |  |  |  | 0 | 37 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 494,423 |  |  |  | 395,805 |  |  |  | 494,423 | 395,805 |
Ending balance: individually evaluated for impairment | 569 |  |  |  | 604 |  |  |  | 569 | 604 |
Ending balance: collectively evaluated for impairment | 493,449 |  |  |  | 394,489 |  |  |  | 493,449 | 394,489 |
Ending balance: loans acquired with deteriorated credit quality | 405 |  |  |  | 712 |  |  |  | 405 | 712 |
Agricultural Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,040 |  |  |  | 958 | 1,040 | 958 |
Charge Offs |  |  |  |  |  |  |  |  |  | (105) |
Provision (Credit) |  |  |  |  |  |  |  |  | (691) | 187 |
Ending Balance | 349 |  |  |  | 1,040 |  |  |  | 349 | 1,040 | 958
Ending balance: individually evaluated for impairment |  |  |  |  | 691 |  |  |  |  | 691 |
Ending balance: collectively evaluated for impairment | 349 |  |  |  | 349 |  |  |  | 349 | 349 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 220,514 |  |  |  | 198,033 |  |  |  | 220,514 | 198,033 |
Ending balance: individually evaluated for impairment | 2,280 |  |  |  | 6,725 |  |  |  | 2,280 | 6,725 |
Ending balance: collectively evaluated for impairment | 218,039 |  |  |  | 191,107 |  |  |  | 218,039 | 191,107 |
Ending balance: loans acquired with deteriorated credit quality | 195 |  |  |  | 201 |  |  |  | 195 | 201 |
Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 709 |  |  |  | 701 | 709 | 701 |
Charge Offs |  |  |  |  |  |  |  |  |  | (143) |
Recoveries |  |  |  |  |  |  |  |  | 7 | 14 |
Provision (Credit) |  |  |  |  |  |  |  |  | 35 | 137 |
Ending Balance | 751 |  |  |  | 709 |  |  |  | 751 | 709 | 701
Ending balance: individually evaluated for impairment |  |  |  |  | 1 |  |  |  |  | 1 |
Ending balance: collectively evaluated for impairment | 751 |  |  |  | 708 |  |  |  | 751 | 708 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 128,926 |  |  |  | 118,504 |  |  |  | 128,926 | 118,504 |
Ending balance: individually evaluated for impairment | 152 |  |  |  | 20 |  |  |  | 152 | 20 |
Ending balance: collectively evaluated for impairment | 128,774 |  |  |  | 118,484 |  |  |  | 128,774 | 118,484 |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 9,130 |  |  |  | 7,415 | 9,130 | 7,415 |
Recoveries |  |  |  |  |  |  |  |  | 9 | 10 |
Provision (Credit) |  |  |  |  |  |  |  |  | 2,785 | 1,705 |
Ending Balance | 11,924 |  |  |  | 9,130 |  |  |  | 11,924 | 9,130 | 7,415
Ending balance: individually evaluated for impairment | 438 |  |  |  | 664 |  |  |  | 438 | 664 |
Ending balance: collectively evaluated for impairment | 11,486 |  |  |  | 8,466 |  |  |  | 11,486 | 8,466 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 1,150,511 |  |  |  | 847,110 |  |  |  | 1,150,511 | 847,110 |
Ending balance: individually evaluated for impairment | 4,108 |  |  |  | 3,561 |  |  |  | 4,108 | 3,561 |
Ending balance: collectively evaluated for impairment | 1,146,389 |  |  |  | 843,299 |  |  |  | 1,146,389 | 843,299 |
Ending balance: loans acquired with deteriorated credit quality | 14 |  |  |  | 250 |  |  |  | 14 | 250 |
Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 3,847 |  |  |  | 3,346 | 3,847 | 3,346 |
Charge Offs |  |  |  |  |  |  |  |  | (418) | (814) |
Recoveries |  |  |  |  |  |  |  |  | 93 | 257 |
Provision (Credit) |  |  |  |  |  |  |  |  | 1,860 | 1,058 |
Ending Balance | 5,382 |  |  |  | 3,847 |  |  |  | 5,382 | 3,847 | 3,346
Ending balance: individually evaluated for impairment | 1,551 |  |  |  | 825 |  |  |  | 1,551 | 825 |
Ending balance: collectively evaluated for impairment | 3,831 |  |  |  | 3,022 |  |  |  | 3,831 | 3,022 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 272,119 |  |  |  | 240,138 |  |  |  | 272,119 | 240,138 |
Ending balance: individually evaluated for impairment | 1,581 |  |  |  | 1,003 |  |  |  | 1,581 | 1,003 |
Ending balance: collectively evaluated for impairment | 270,493 |  |  |  | 238,849 |  |  |  | 270,493 | 238,849 |
Ending balance: loans acquired with deteriorated credit quality | 45 |  |  |  | 286 |  |  |  | 45 | 286 |
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 625 |  |  |  | 606 | 625 | 606 |
Charge Offs |  |  |  |  |  |  |  |  | (409) | (251) |
Recoveries |  |  |  |  |  |  |  |  | 169 | 164 |
Provision (Credit) |  |  |  |  |  |  |  |  | 506 | 106 |
Ending Balance | 891 |  |  |  | 625 |  |  |  | 891 | 625 | 606
Ending balance: individually evaluated for impairment | 1 |  |  |  | 3 |  |  |  | 1 | 3 |
Ending balance: collectively evaluated for impairment | 890 |  |  |  | 622 |  |  |  | 890 | 622 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 89,894 |  |  |  | 57,829 |  |  |  | 89,894 | 57,829 |
Ending balance: individually evaluated for impairment | 167 |  |  |  | 26 |  |  |  | 167 | 26 |
Ending balance: collectively evaluated for impairment | 89,727 |  |  |  | 57,803 |  |  |  | 89,727 | 57,803 |
Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 34 |  |  |  | 13 | 34 | 13 |
Provision (Credit) |  |  |  |  |  |  |  |  | (16) | 21 |
Ending Balance | 18 |  |  |  | 34 |  |  |  | 18 | 34 | 13
Ending balance: collectively evaluated for impairment | 18 |  |  |  | 34 |  |  |  | 18 | 34 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 1,041 |  |  |  | $ 641 | 1,041 | 641 |
Other Non-interest expense related to unfunded |  |  |  |  |  |  |  |  | 221 | 400 |
Ending Balance | 1,262 |  |  |  | 1,041 |  |  |  | 1,262 | 1,041 | $ 641
Ending balance: collectively evaluated for impairment | 1,262 |  |  |  | 1,041 |  |  |  | 1,262 | 1,041 |
Ending balance: loans acquired with deteriorated credit quality | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |

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