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Defined Contribution Plan (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) yr	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Defined Contribution Plan [Abstract]
Minimum age (in years) | yr	21
Defined contribution plan, employer matching contribution, percent of match	50.00%
Defined contribution plan, maximum annual contribution per employee	5.00%
Defined contribution plan, cost | $	$ 2.6	$ 2.5	$ 2.9

X

- Definition

The minimum age to participate in the 401(k) Plan.

+ References

No definition available.

+ Details

Name:	gdot_MinimumAge
Namespace Prefix:	gdot_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration