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Mortgage Servicing Rights Mortgage Servicing Rights (MSR Carrying Value) ((Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Mortgage servicing rights | $ 16,436 us-gaap_ServicingAsset | $ 0 us-gaap_ServicingAsset | $ 16,688 us-gaap_ServicingAsset | $ 16 us-gaap_ServicingAsset
Amortization of Mortgage Servicing Rights (MSRs) | (852)us-gaap_AmortizationOfMortgageServicingRightsMSRs | (164)us-gaap_AmortizationOfMortgageServicingRightsMSRs |  |
Servicing Asset at Amortized Cost, Additions | 662 us-gaap_ServicingAssetAtAmortizedValueAdditions | 0 us-gaap_ServicingAssetAtAmortizedValueAdditions |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions | 62 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries | 0 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries |  |
1st Financial |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Asset at Amortized Cost, Additions | $ 0 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_BusinessAcquisitionAxis = fcnca_A1stFinancialMember | $ 148 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_BusinessAcquisitionAxis = fcnca_A1stFinancialMember |  |

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- Definition The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
Name: | us-gaap_ServicingAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Details
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- 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
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- Details
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