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Minimum Regulatory Capital Requirements - Summary of Bank's Actual and Required Capital Amounts and Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount $ 131,493 $ 123,031
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio 14.73% 14.46%
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount $ 40,177 $ 38,296
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 Actual, Amount $ 138,588 $ 130,032
Tier 1 Capital to Risk Weighted Assets Actual, Amount 131,493 123,031
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount $ 131,493 $ 123,031
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio 15.52% 15.28%
Tier 1 Capital to Risk Weighted Assets Actual, Ratio 14.73% 14.46%
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio 12.02% 11.77%
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount $ 71,426 $ 68,081
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 53,569 51,061
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount $ 43,765 $ 41,826
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 6.00% 6.00%
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio 4.00% 4.00%
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 $ 107,006 $ 100,999
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio 12.04% 11.91%
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount $ 39,992 $ 38,156
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 4.50% 4.50%
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 57,767 $ 55,115
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 Actual, Amount $ 114,101 $ 108,000
Tier 1 Capital to Risk Weighted Assets Actual, Amount 107,006 100,999
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount $ 107,006 $ 100,999
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio 12.84% 12.73%
Tier 1 Capital to Risk Weighted Assets Actual, Ratio 12.04% 11.91%
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio 9.92% 9.75%
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount $ 71,098 $ 67,833
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 53,323 50,875
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount $ 43,148 $ 41,425
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 6.00% 6.00%
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio 4.00% 4.00%
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 88,872 $ 84,792
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 71,098 67,833
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 53,935 $ 51,181
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 10.00% 10.00%
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 8.00% 8.00%
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 5.00% 5.00%