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Capital Ratios (Narrative) (Details) - USD ($) $ in Billions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Total Risk-based Capital Ratio: Ratio |  | 15.80% |  |
Capital Ratios, Basel III, Capital Conservation Buffer, Year Two |  | 1.875% |  |
Capital Ratios, Basel III, Capital Conservation Buffer, Year Three |  | 2.50% |  |
Consolidated asset limit on small bank holding companies |  | $ 3 |  |
Farmers & Merchants Trust Company [Member] |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common Equity Tier 1 Risk-based Capital Ratio: Ratio | [1] | 14.27% |  | 13.80%
Tier One Leverage Capital to Average Assets | [2] | 9.28% |  | 9.68%
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | [1] | 6.50% |  |
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio |  | 8.00% | [3] | 6.00%
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | [2] | 5.00% |  |
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | [4] | 10.00% |  |
Capital ratios, capital conservation buffer |  | 7.80% |  |
Total Risk-based Capital Ratio: Ratio | [4] | 15.52% |  | 15.06%
[1] | Common equity Tier 1 capital/ total risk-weighted assets
[2] | Tier 1 capital / average quarterly assets
[3] | Tier 1 capital / total risk-weighted assets
[4] | Total risk-based capital / total risk-weighted assets

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