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Note 11 - Fair Value Measurements (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Liabilities, Fair Value Disclosure	$ 0		$ 0		$ 0
Number of Foreclosed Real Estate Properties					0
Impaired Loan [Member]
Provision for Loan, Lease, and Other Losses	0	$ 3,000	$ 40,000	$ 4,000
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Estimated Selling Costs			30.00%
Foreclosed Real Estate [Member]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount	$ 0		$ 0
Foreclosed Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Estimated Selling Costs			9.00%

X

- Definition

Represents the fair value inputs estimated selling costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of foreclosed real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcap_
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Balance Type:	na
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X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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Period Type:	instant

X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

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Period Type:	duration

X

- Definition

Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 970
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Footnote 5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479438/970-360-S99-1

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- Details

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- Details

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