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Loans - Loans (Detail) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Loans: |  |  |  |
Loans - Gross | $ 2,144,018,000 | $ 1,859,157,000 |  |
Less: Net deferred loan fees and costs | (1,402,000) | (1,738,000) |  |
Loans after net deferred loan fees and costs | 2,142,616,000 | 1,857,419,000 | $ 1,495,562,000 |
Less: Allowance for loan losses | (19,990,000) | (16,242,000) |  | $ (13,672,000)
Loans - Net | 2,122,626,000 | 1,841,177,000 |  |
Consumer Real Estate [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 416,001,000 | 395,873,000 |  |
Loans after net deferred loan fees and costs | 416,044,000 | 395,805,000 | 202,370,000 |
Agricultural Real Estate [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 205,089,000 | 198,343,000 |  |
Loans after net deferred loan fees and costs | 204,787,000 | 198,033,000 | 179,051,000 |
Agricultural [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 128,615,000 | 118,368,000 |  |
Loans after net deferred loan fees and costs | 128,818,000 | 118,504,000 | 105,722,000 |
Commercial Real Estate [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 1,063,661,000 | 848,477,000 |  |
Loans after net deferred loan fees and costs | 1,061,904,000 | 847,110,000 | 727,418,000 |
Commercial and Industrial [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 229,388,000 | 208,270,000 |  |
Loans after net deferred loan fees and costs | 229,338,000 | 208,049,000 |  |
Less: Allowance for loan losses | 0 |  |  |
Consumer [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 70,602,000 | 57,737,000 |  |
Loans after net deferred loan fees and costs | 71,063,000 | 57,829,000 | $ 55,619,000 |
Other Loan [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 30,662,000 | 32,089,000 |  |
Loans after net deferred loan fees and costs | $ 30,662,000 | $ 32,089,000 |  |

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