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Note 14 - Deferred Compensation Plans (Details Textual)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Peoples Bancorp, Inc [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year)			10 years
Number of Key Employees			3
Officer [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year)			15 years
Deferred Compensation Liability, Current and Noncurrent	$ 66,000	$ 104,000
Deferred Compensation Arrangement with Individual, Compensation Expense	3,000	5,000	$ 7,000
Director [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year)			15 years
Deferred Compensation Liability, Current and Noncurrent	124,000	127,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 15,000	$ 15,000	$ 16,000

X

- Definition

Represents the number of key employees for whom the Bank will provide income following their retirement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 710
-SubTopic 10
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483043/710-10-30-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482943/710-10-55-7

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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X

- Details

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X

- Details

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