Debt Interest Rate Converted To By Interst Rate Swaps From July 1 2011 Through June 30 2016

No definition available.

Name:	fcnca_DebtInterestRateConvertedToByInterstRateSwapsFromJuly12011ThroughJune302016
Namespace Prefix:	fcnca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Interest Rate Converted To By Interst Rate Swaps Through June 30 2011

+ References

No definition available.

+ Details

Name:	fcnca_DebtInterestRateConvertedToByInterstRateSwapsThroughJune302011
Namespace Prefix:	fcnca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest Rate Swaps Used

+ References

No definition available.

+ Details

Name:	fcnca_InterestRateSwapsUsed
Namespace Prefix:	fcnca_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Trust Preferred Securities Redeemed

+ References

No definition available.

+ Details

Name:	fcnca_TrustPreferredSecuritiesRedeemed
Namespace Prefix:	fcnca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 16

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 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

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

- Details

Name:	us-gaap_LongTermDebtByMaturityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt maturities after year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

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

- Definition

Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

+ Details

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

- Definition

Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

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

- Definition

Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

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

- Definition

Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

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

- Definition

Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

+ Details

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

- Definition

The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

LONG-TERM OBLIGATIONS (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended			12 Months Ended					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 interestrateswaps	Dec. 31, 2010	Dec. 31, 2011 Junior Subordinated Debt [Member] Debenture Of 1998 [Member]	Dec. 31, 1998 Junior Subordinated Debt [Member] Preferred Securities Of 1998 [Member]	Dec. 31, 2011 Junior Subordinated Debt [Member] Junior Subordinated Debenture At 8 Point 05 Percent Maturing March 5 2028 [Member]	Dec. 31, 2010 Junior Subordinated Debt [Member] Junior Subordinated Debenture At 8 Point 05 Percent Maturing March 5 2028 [Member]	Dec. 31, 2011 Junior Subordinated Debt [Member] Junior Subordinanted Debenture At 3 Month Libor Plus 1 Point 75 Percent Maturing June 30 2036 [Member]	Dec. 31, 2010 Junior Subordinated Debt [Member] Junior Subordinanted Debenture At 3 Month Libor Plus 1 Point 75 Percent Maturing June 30 2036 [Member]	Dec. 31, 2006 Junior Subordinated Debt [Member] Preferred Securities Of 2006 [Member]	Dec. 31, 2011 Junior Subordinated Debt [Member] Preferred Securities Of 2006 [Member] Libor 3 Month Rate [Member]	Dec. 31, 2011 Junior Subordinated Debt [Member] Debenture Of 2006 [Member] Libor 3 Month Rate [Member]	Dec. 31, 2011 Subordinated Debt [Member] Subordinated Notes Payable At 5 Point 125 Percent Maturing June 1 2015 [Member]	Dec. 31, 2010 Subordinated Debt [Member] Subordinated Notes Payable At 5 Point 125 Percent Maturing June 1 2015 [Member]	Dec. 31, 2011 Capital Lease Obligations [Member]	Dec. 31, 2010 Capital Lease Obligations [Member]	Dec. 31, 2011 Federal Home Loan Bank Advances [Member] Rates Ranging From 2 Point 85 Percent To 4 Point 12 Percent And Maturities Ranging From October 2010 to September 2018 [Member]	Dec. 31, 2010 Federal Home Loan Bank Advances [Member] Rates Ranging From 2 Point 85 Percent To 4 Point 12 Percent And Maturities Ranging From October 2010 to September 2018 [Member]	Dec. 31, 2011 Federal Home Loan Bank Advances [Member] Rates Ranging From 2 Point 85 Percent To 4 Point 12 Percent And Maturities Ranging From October 2010 to September 2018 [Member] Minimum [Member]	Dec. 31, 2011 Federal Home Loan Bank Advances [Member] Rates Ranging From 2 Point 85 Percent To 4 Point 12 Percent And Maturities Ranging From October 2010 to September 2018 [Member] Maximum [Member]	Dec. 31, 2011 Federal Home Loan Bank Advances [Member] Rates Ranging From 4 Point 74 Percent To 5 Point 38 Percent And Maturities Ranging From July 2012 To July 2017 [Member]	Dec. 31, 2010 Federal Home Loan Bank Advances [Member] Rates Ranging From 4 Point 74 Percent To 5 Point 38 Percent And Maturities Ranging From July 2012 To July 2017 [Member]	Dec. 31, 2011 Federal Home Loan Bank Advances [Member] Rates Ranging From 4 Point 74 Percent To 5 Point 38 Percent And Maturities Ranging From July 2012 To July 2017 [Member] Minimum [Member]	Dec. 31, 2011 Federal Home Loan Bank Advances [Member] Rates Ranging From 4 Point 74 Percent To 5 Point 38 Percent And Maturities Ranging From July 2012 To July 2017 [Member] Maximum [Member]	Dec. 31, 2011 Collateralized Mortgage Backed Securities [Member]	Dec. 31, 2010 Collateralized Mortgage Backed Securities [Member]	Dec. 31, 2011 Unamortized Purchase Accounting Adjustments [Member]	Dec. 31, 2010 Unamortized Purchase Accounting Adjustments [Member]	Dec. 31, 2011 Other Long Term Debt [Member]	Dec. 31, 2010 Other Long Term Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				8.05%									5.125%						2.85%	4.12%			4.74%	5.38%
Proceeds from Issuance of Trust Preferred Securities					$ 150,000					$ 115,000
Trust Preferred Securities Redeemed	21,500
Interest Rate Swaps Used (interest rate swaps)		2
Debt Instrument, Basis Spread on Variable Rate											1.75%	1.75%
Debt Interest Rate Converted To By Interst Rate Swaps Through June 30 2011	7.125%	7.125%
Debt Interest Rate Converted To By Interst Rate Swaps From July 1 2011 Through June 30 2016	5.50%	5.50%
Long-term Debt, by Maturity [Abstract]
2012	30,752	30,752
2013	63,849	63,849
2014	1,063	1,063
2015	205,947	205,947
2016	812	812
Thereafter	385,176	385,176
Total long-term obligations	$ 687,599	$ 687,599	$ 809,949			$ 154,640	$ 154,640	$ 97,057	$ 118,557				$ 125,000	$ 125,000	$ 5,688	$ 9,903	$ 225,000	$ 250,000			$ 10,000	$ 50,000			$ 35,645	$ 65,403	$ 4,420	$ 6,288	$ 30,149	$ 30,158