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Deposits (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Time Deposits [Abstract]
Time deposits greater than FDIC limit	$ 344.0	$ 355.9

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- References

No definition available.

+ Details

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

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- Definition

Time deposits that meet or exceed the $250,000 FDIC limit

+ References

No definition available.

+ Details

Name:	wash_TimedepositsgreaterthanFDIClimit
Namespace Prefix:	wash_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant