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Note 2 - Investment Securities (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value, Total |  |  |  |  | $ 0
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage | 3.40% |  | 3.40% |  |
Municipal Notes [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain | $ 211,000 |  | $ 218,000 |  |
Debt Securities, Available-for-sale, Realized Loss | $ 307,000 |  | 307,000 |  |
U.S Government Agency Mortgage-backed CMO [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain |  | $ 58,000 |  | $ 3,000 |
Debt Securities, Available-for-sale, Realized Loss |  |  | $ 6,000 |  |

X
- Definition This item represents the depreciated percentage of available-for-sale investments in a loss position from amortized cost. + References No definition available. + Details
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Namespace Prefix: | fcap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |