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Capital Requirements - Narrative (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Capital Requirements [Abstract]
Minimum bank reserve balance	$ 0	$ 0

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- Definition

Capital Requirements [Abstract]

+ References

No definition available.

+ Details

Name:	finw_CapitalRequirementsAbstract
Namespace Prefix:	finw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Bank regulations require maintenance of certain minimum reserve balances.

+ References

No definition available.

+ Details

Name:	finw_MinimumMaintenanceReserveBalances
Namespace Prefix:	finw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant