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Minimum Regulatory Capital Requirements - Summary of Bank's Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jan. 01, 2019
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount | $ 268,308 | $ 251,649 |
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount | 328,808 | 297,179 |
Tier 1 Capital to Risk Weighted Assets Actual, Amount | 268,308 | 251,649 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount | $ 268,308 | $ 251,649 |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 10.44% | 9.75% |
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio | 0.128 | 0.1151 |
Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 0.1044 | 0.0975 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio | 0.0812 | 0.0786 | 0.040
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount | $ 115,611 | $ 116,147 |
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 205,530 | 206,484 |
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 154,148 | 154,863 |
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount | $ 132,235 | $ 128,081 |
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 4.50% | 4.50% |
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 0.08 | 0.08 | 0.080
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 0.06 | 0.06 |
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio | 0.04 | 0.04 |
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 166,993 | $ 167,768 |
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 256,913 | 258,105 |
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 205,530 | 206,484 |
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 165,294 | $ 160,102 |
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 6.50% | 6.50% |
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 0.10 | 0.10 |
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 0.08 | 0.08 |
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 0.05 | 0.05 |
Farmers & Merchants State Bank [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount | $ 292,845 | $ 276,467 |
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount | 318,527 | 301,176 |
Tier 1 Capital to Risk Weighted Assets Actual, Amount | 292,845 | 276,467 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount | $ 292,845 | $ 276,467 |
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 11.40% | 10.77% |
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio | 0.124 | 0.1173 |
Tier 1 Capital to Risk Weighted Assets Actual, Ratio | 0.1140 | 0.1077 |
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio | 0.0881 | 0.0866 |
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount | $ 115,583 | $ 115,534 |
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 205,482 | 205,393 |
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount | 154,111 | 154,045 |
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount | $ 132,967 | $ 127,674 |
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 4.50% | 4.50% |
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 0.08 | 0.08 |
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio | 0.06 | 0.06 |
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio | 0.04 | 0.04 |
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 166,954 | $ 166,882 |
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 256,852 | 256,742 |
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | 205,482 | 205,393 |
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount | $ 166,209 | $ 159,593 |
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 6.50% | 6.50% |
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 0.10 | 0.10 |
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 0.08 | 0.08 |
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio | 0.05 | 0.05 |

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