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v2.3.0.11

Derivatives (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2006-2011 [Member] | Dec. 31, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2006-2011 [Member] | Jun. 30, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2006-2011 [Member] | Jun. 30, 2011 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2011-2016 [Member] | Dec. 31, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2011-2016 [Member] | Jun. 30, 2010 Interest Rate Swap Hedging Variable Rate Exposure On Trust Preferred Securities 2011-2016 [Member]
Basis points above LIBOR for variable-rate payments |  |  | 175 |  |  | 175 |  |
notional amount of interest rate derivatives |  |  | $ 115,000 | $ 115,000 | $ 115,000 | $ 115,000 | $ 115,000 | $ 115,000
Number of interest rate swaps | 1 |  |  |  |  |  |  |
Fixed rate payments, interest rate |  |  | 7.125% |  |  | 5.50% |  |
Fair value of collateral pledged to secure interest rate contracts | 14,691 |  |  |  |  |  |  |
Incremental interest expense paid to interest rate swap counterparties | $ 2,931 | $ 2,951 |  |  |  |  |  |

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- Definition Basis Points Above LIBOR For Variable-Rate Payments + Details
Name: | fcnca_BasisPointsAboveLiborForVariableRatePayments
Namespace Prefix: | fcnca
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of collateral pledged to secure interest rate contracts + Details
Name: | fcnca_FairValueOfCollateralPledgedToSecureInterestRateContracts
Namespace Prefix: | fcnca
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Incremental interest expense paid to interest rate swap counterparties + Details
Name: | fcnca_IncrementalInterestExpensePaidToInterestRateSwapCounterparties
Namespace Prefix: | fcnca
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fixed interest rate related to the interest rate derivative. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap
Data Type: | us-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of derivative instruments of a particular group held by the entity. + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + Details
Name: | us-gaap_NotionalAmountOfInterestRateDerivatives
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant