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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, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Amount $ 115,386  
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio 14.18%  
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount $ 36,626  
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 4.50%  
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount $ 121,651 $ 114,702
Tier 1 Capital to Risk Weighted Assets Actual, Amount 115,386 108,590
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount $ 115,386 $ 108,590
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio 14.95% 16.68%
Tier 1 Capital to Risk Weighted Assets Actual, Ratio 14.18% 15.79%
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio 11.91% 11.70%
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount $ 65,113 $ 55,028
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 48,834 27,514
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount $ 38,752 $ 37,111
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% 4.00%
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 $ 96,231  
Common Equity Tier 1 Capital to Risk Weighted Assets Actual, Ratio 11.87%  
Common Equity Tier 1 Capital For Capital Adequacy Purposes, Amount $ 36,494  
Common Equity Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Ratio 4.50%  
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 52,714  
Common Equity Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 6.50%  
Total Risk-Based Capital to Risk Weighted Assets Actual, Amount $ 102,496 $ 98,154
Tier 1 Capital to Risk Weighted Assets Actual, Amount 96,231 92,042
Tier 1 leverage Capital to Adjusted Total Assets Actual, Amount $ 96,231 $ 92,042
Total Risk-Based Capital to Risk Weighted Assets Actual, Ratio 12.64% 14.35%
Tier 1 Capital to Risk Weighted Assets Actual, Ratio 11.87% 13.46%
Tier 1 leverage Capital to Adjusted Total Assets Actual, Ratio 10.12% 10.01%
Total Risk-Based Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount $ 64,879 $ 54,710
Tier 1 Capital to Risk Weighted Assets For Capital Adequacy Purposes, Amount 48,689 27,355
Tier 1 leverage Capital to Adjusted Total Assets For Capital Adequacy Purposes, Amount $ 38,019 $ 36,785
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% 4.00%
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 $ 81,099 $ 68,388
Tier 1 Capital to Risk Weighted Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount 64,879 41,033
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Amount $ 47,524 $ 45,981
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% 6.00%
Tier 1 leverage Capital to Adjusted Total Assets To Be Well Capitalized Under the Prompt Corrective Action Provisions, Ratio 5.00% 5.00%