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CONSOLIDATED STATEMENTS OF INCOME (unaudited) (Parenthetical)	Dec. 16, 2019
Income Statement [Abstract]
Dividend percent	10.00%

X

- Definition

Common Stock, Dividend Percentage

+ References

No definition available.

+ Details

Name:	fgbi_CommonStockDividendPercentage
Namespace Prefix:	fgbi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration