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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
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