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Securities - Contractual Maturities - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Securities
Proceeds from maturities, calls and principal repayments of securities	$ 9,500,000	$ 6,200,000
Proceeds from calls and maturities of securities	1,000,000.0	1,000,000.0
Gross realized gains on securities		97,000
Gross realized loss on securities	$ 0	$ 0

X

- Definition

Amount of realized gains on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

No definition available.

+ Details

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X

- Definition

Amount of realized losses on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

No definition available.

+ Details

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Namespace Prefix:	fvcb_
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Balance Type:	debit
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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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