XML 46 R72.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Mortgage Servicing Rights Mortgage servicing rights (Valuation allowance) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Mortgage Servicing Rights [Abstract] |  |  |  |
Valuation allowance | $ 912 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance | $ 0 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance | $ 850 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance | $ 0 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Valuation allowance provision | $ (62)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries | $ 0 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries |  |

X
- Details
Name: | fcnca_MortgageServicingRightsAbstract
Namespace Prefix: | fcnca_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
Name: | us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition New provisions recoveries or charged against this account which increase or reduce the net value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
Name: | us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration