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Capital Ratios (Narrative) (Details)
Jun. 30, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Ratios, Basel III, Capital Conservation Buffer 0.00%  
Future Capital Ratios Basel III Capital Conservation Buffer 2.50%  
Farmers & Merchants Trust Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum [1] 6.50%  
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum [2] 8.00%  
Tier 1 Leverage Ratio: Well Capitalized Minimum 5.00% [3] 6.00%
Total Risk-based Capital Ratio: Well Capitalized Minimum [4] 10.00%  
[1] Common equity Tier 1 capital/ total risk-weighted assets
[2] Tier 1 capital / total risk-weighted assets
[3] Tier 1 capital / average quarterly assets
[4] Total risk-based capital / total risk-weighted assets