XML 127 R115.htm IDEA: XBRL DOCUMENT v3.22.1

Federal Reserve Requirements (Narrative) (Details)	Mar. 26, 2020
Federal Reserve Requirements [Abstract]
Reserve requirement ratios	0.00%

X

- Definition

Reserve Requirement Ratios

+ References

No definition available.

+ Details

Name:	func_ReserveRequirementRatios
Namespace Prefix:	func_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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