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Regulatory Matters (Narrative) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

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

Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval

$ 96.1

Capital Ratios, Basel III, Capital Conservation Buffer

0.625%

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

1.25%

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

1.875%

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

2.50%

Regulatory buffer percentage

1.875%

Pennsylvania [Member]

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

Common Equity Tier 1 Risk-based Capital Ratio: Ratio

10.00%

Tier One Leverage Capital to Average Assets

6.00%

Farmers & Merchants Trust Company [Member]

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

Common Equity Tier 1 Risk-based Capital Ratio: Ratio

13.80%

13.93%

^[1]

Tier One Leverage Capital to Average Assets

9.68%

9.64%

^[2]

Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio

6.50%

6.50%

^[1]

Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio

8.00%

8.00%

^[3]

Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio

5.00%

5.00%

^[2]

Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio

10.00%

10.00%

^[4]

Capital ratios, capital conservation buffer

7.06%

Total Risk-based Capital Ratio: Ratio

15.06%

15.19%

^[4]

[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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-Topic 942
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Amount of dividends that can be declared or paid without approval of regulatory agency.

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