Note 4 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Principal loan balance	$ 470,418	$ 437,230
Accrued interest receivable	1,632	1,530
Net deferred loan origination fees and costs	1,137	1,095
Recorded investment in loans	473,187	439,855
Commercial Portfolio Segment [Member]
Principal loan balance	45,307	36,297
Accrued interest receivable	142	120
Net deferred loan origination fees and costs
Recorded investment in loans	45,449	36,417
Real Estate Loan [Member] \| Real Estate Mortgage Portfolio Segment [Member]
Principal loan balance	131,959	136,445
Accrued interest receivable	462	475
Net deferred loan origination fees and costs	118	99
Recorded investment in loans	132,539	137,019
Land Loan [Member] \| Real Estate Mortgage Portfolio Segment [Member]
Principal loan balance	19,185	22,607
Accrued interest receivable	114	119
Net deferred loan origination fees and costs	15	18
Recorded investment in loans	19,314	22,744
Construction Loans [Member] \| Real Estate Mortgage Portfolio Segment [Member]
Principal loan balance	32,559	25,375
Accrued interest receivable	86	76
Net deferred loan origination fees and costs	(1)	(9)
Recorded investment in loans	32,644	25,442
Commercial Real Estate Loan [Member] \| Real Estate Mortgage Portfolio Segment [Member]
Principal loan balance	121,563	107,445
Accrued interest receivable	312	265
Net deferred loan origination fees and costs	(62)	(38)
Recorded investment in loans	121,813	107,672
Home Equity and Second Mortgage [Member] \| Consumer Portfolio Segment [Member]
Principal loan balance	54,677	51,731
Accrued interest receivable	244	247
Net deferred loan origination fees and costs	1,067	1,025
Recorded investment in loans	55,988	53,003
Other Consumer Loan [Member] \| Consumer Portfolio Segment [Member]
Principal loan balance	65,168	57,330
Accrued interest receivable	272	228
Net deferred loan origination fees and costs
Recorded investment in loans	$ 65,440	$ 57,558

Represents loans and leases receivable accrued interest.

No definition available.

Name:	fcap_LoansAndLeasesReceivableAccruedInterest
Namespace Prefix:	fcap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the loans and leases receivable principal balance.

+ References

No definition available.

+ Details

Name:	fcap_LoansAndLeasesReceivablePrincipalBalance
Namespace Prefix:	fcap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

+ Details

Name:	us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=fcap_RealEstateMortgagePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_LandLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_CommercialRealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_HomeEquityAndSecondMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcap_OtherConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: