Investment Securities (Held-to-maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Held to maturity-
Held to maturity, amortized cost	$ 123,136	$ 123,762
Held to maturity, other than temporary impairment recognized in accumulated other comprehensive loss	(501)	(501)
Carrying Value, Total	122,635	123,261
Held to maturity, gross unrealized gains	5,269	3,967
Held to maturity, gross unrealized losses	(5)	(71)
Held to maturity, fair value	127,899	127,157
U. S. Treasury securities and obligations of U.S. Government sponsored corporations (“GSE”) and agencies [Member]
Held to maturity-
Held to maturity, amortized cost	4,082
Held to maturity, other than temporary impairment recognized in accumulated other comprehensive loss	0
Carrying Value, Total	4,082
Held to maturity, gross unrealized gains	31
Held to maturity, gross unrealized losses	0
Held to maturity, fair value	4,113
Residential collateralized mortgage obligations - GSE [Member]
Held to maturity-
Held to maturity, amortized cost	14,254	13,630
Held to maturity, other than temporary impairment recognized in accumulated other comprehensive loss	0	0
Carrying Value, Total	14,254	13,630
Held to maturity, gross unrealized gains	509	404
Held to maturity, gross unrealized losses	0	0
Held to maturity, fair value	14,763	14,034
Residential mortgage backed securities - GSE [Member]
Held to maturity-
Held to maturity, amortized cost	45,118	47,718
Held to maturity, other than temporary impairment recognized in accumulated other comprehensive loss	0	0
Carrying Value, Total	45,118	47,718
Held to maturity, gross unrealized gains	1,750	928
Held to maturity, gross unrealized losses	0	(46)
Held to maturity, fair value	46,868	48,600
Obligations of state and political subdivisions [Member]
Held to maturity-
Held to maturity, amortized cost	58,485	61,135
Held to maturity, other than temporary impairment recognized in accumulated other comprehensive loss	0	0
Carrying Value, Total	58,485	61,135
Held to maturity, gross unrealized gains	2,707	2,294
Held to maturity, gross unrealized losses	(1)	(14)
Held to maturity, fair value	61,191	63,415
Trust preferred debt securities-pooled [Member]
Held to maturity-
Held to maturity, amortized cost	656	657
Held to maturity, other than temporary impairment recognized in accumulated other comprehensive loss	(501)	(501)
Carrying Value, Total	155	156
Held to maturity, gross unrealized gains	272	341
Held to maturity, gross unrealized losses	0	0
Held to maturity, fair value	427	497
Other debt securities [Member]
Held to maturity-
Held to maturity, amortized cost	541	622
Held to maturity, other than temporary impairment recognized in accumulated other comprehensive loss	0	0
Carrying Value, Total	541	622
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(4)	(11)
Held to maturity, fair value	$ 537	$ 611

No definition available.

Name:	fccy_HeldToMaturityAbstract
Namespace Prefix:	fccy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

+ Details

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

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.6)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

+ References

+ Details

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

- Definition

Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

No definition available.

+ Details

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

- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

+ Details

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

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=fccy_ResidentialCollateralizedMortgageObligationsGSEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=fccy_TrustPreferredDebtSecuritiesPooledMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: