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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, 2018
Dec. 31, 2017
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount   $ 131,493
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount   138,588
Tier 1 Capital to Risk Weighted Assets Actual, Amount   131,493
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount   $ 131,493
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio   14.73%
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio   15.52%
Tier 1 Capital to Risk Weighted Assets Actual, Ratio   14.73%
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio   12.02%
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount   $ 40,177
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount   71,426
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount   53,569
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount   $ 43,765
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio   4.50%
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio   8.00%
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio   6.00%
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Ratio   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 $ 114,978 $ 107,006
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount 122,027 114,101
Tier 1 Capital to Risk Weighted Assets Actual, Amount 114,978 107,006
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount $ 114,978 $ 107,006
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio 12.67% 12.04%
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio 13.45% 12.84%
Tier 1 Capital to Risk Weighted Assets Actual, Ratio 12.67% 12.04%
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio 10.54% 9.92%
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount $ 40,834 $ 39,992
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 72,594 71,098
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 54,446 53,323
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount $ 43,644 $ 43,148
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 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%
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 58,983 $ 57,767
Total Risk-Based Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 90,743 88,872
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 72,594 71,098
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 54,555 $ 53,935
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 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%