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Note 21 - Regulatory Requirements and Restrictions (Details Textual) | Jan. 01, 2016 | Jan. 01, 2019
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Capital Conservation Buffer | 0.625% | 2.50%
Tier One Capital Securities Phase Out Period | 4 years |
Capital Conservation Buffer Phase In Amount | 0.625% |

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- Definition An additional amount held in risk-based capital designed to ensure that banks build up capital buffers outside periods of stress which can be drawn down as losses are incurred. The requirement is based on simple capital conservation rules designed to avoid breaches of minimum capital requirements. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount resulting from the phase-in of a capital conservation buffer. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the phase out period for Tier 1 capital securities. + References No definition available. + Details
Name: | fcbc_TierOneCapitalSecuritiesPhaseOutPeriod
Namespace Prefix: | fcbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration