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Note 1 - Basis of Presentation (Details Textual) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Number of Operating Segments | 1 |
Interchange Income | $ 1,760 | $ 1,600
Interchange Expense | 650 | 576
Interchange Income (Expense), Net | $ 1,110 | $ 1,030

X
- Definition The amount of interchange expense due to credit and debit card transactions during the period. + References No definition available. + Details
Name: | fcbc_InterchangeExpense
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of interchange income due to credit and debit card transactions during the period. + References No definition available. + Details
Name: | fcbc_InterchangeIncome
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net amount of interchange income (expense), net, from credit and debit card expenses. + References No definition available. + Details
Name: | fcbc_InterchangeIncomeExpenseNet
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration