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Transactions with Related Persons (Details) (USD $)	12 Months Ended
Transactions with Related Persons (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 1,825,000
New loans	39,000
Repayments	(819,000)
Ending balance	1,045,000	1,825,000
Unfunded loan commitments available to related parties	1,300,000	5,500,000
Revenue from related parties	17,200,000us-gaap_RevenueFromRelatedParties	21,600,000us-gaap_RevenueFromRelatedParties	33,700,000us-gaap_RevenueFromRelatedParties
Revenue from largest individual institution related parties	16,800,000	20,400,000	22,800,000
Investment Securities Available For Sale Related Parties	25,000,000	21,600,000
Investment Cost Related Parties	$ 23,000,000fcnca_InvestmentCostRelatedParties	$ 452,000fcnca_InvestmentCostRelatedParties

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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