XML 67 R34.htm IDEA: XBRL DOCUMENT ﻿
v2.3.0.11

Investments (Narrative) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2010
--- | --- | --- | ---
Investments |  |  |
Investment securities, aggregate fair value, continuous unrealized losses of more than 12 months | $ 2,050 |  |
Investment securities, aggregate unrealized loss, continuous unrealized losses of more than 12 months | 76 |  |
Number of investments in continuous unrealized loss position for more than twelve months | 18 |  |
Investment securities, aggregate carrying value, pledged as collateral | $ 2,684,107 | $ 2,096,850 | $ 1,694,084

X
- Definition Investment securities, aggregate carrying value, pledged as collateral + Details
Name: | fcnca_InvestmentSecuritiesAggregateCarryingValuePledgedAsCollateral
Namespace Prefix: | fcnca
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment securities, aggregate fair value, continuous unrealized losses of more than 12 months + Details
Name: | fcnca_InvestmentSecuritiesAggregateFairValueContinuousUnrealizedLossesOfMoreThan12Months
Namespace Prefix: | fcnca
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment securities, aggregate unrealized loss, continuous unrealized losses of more than 12 months + Details
Name: | fcnca_InvestmentSecuritiesAggregateUnrealizedLossContinuousUnrealizedLossesOfMoreThan12Months
Namespace Prefix: | fcnca
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of Investments in Continuous Unrealized Loss Position for More Than Twelve Months + Details
Name: | fcnca_NumberOfInvestmentsInContinuousUnrealizedLossPositionForMoreThanTwelveMonths
Namespace Prefix: | fcnca
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration