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Capital Ratios (Narrative) (Details)

6 Months Ended

Jun. 30, 2019

Dec. 31, 2018

Dec. 31, 2017

Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]

Total Risk-based Capital Ratio: Ratio

15.19%

Capital Ratios, Basel III, Capital Conservation Buffer

1.25%

0.625%

Capital Ratios, Basel III, Capital Conservation Buffer, Year Two

1.875%

Capital Ratios, Basel III, Capital Conservation Buffer, Year Three

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: Ratio

^[1]

13.77%

13.80%

Tier One Leverage Capital to Average Assets

^[2]

9.52%

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

7.19%

Total Risk-based Capital Ratio: Ratio

^[4]

15.02%

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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Capital Ratios, Basel III, Capital Conservation Buffer

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-SubTopic 505
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