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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | Sep. 30, 2017 subsidary
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The Bank |
Subsequent Event [Line Items] |
Number of wholly-owned non-bank subsidiaries | 5

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- Definition Number of Subsidiaries + References No definition available. + Details
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Namespace Prefix: | gnty_
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Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |