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Capital Requirements - Narrative (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
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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