Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Loans and leases	$ 700,525	$ 757,197	$ 967,601
Investment securities:
U. S. Treasury	11,656	1,645	2,471
Government agency	7,410	12,265	15,688
Residential mortgage-backed securities	36,492	22,642	14,388
State, county and municipal	13	12	36
Other	640	320	2,914
Total investment securities interest and dividend income	56,211	36,884	35,497
Overnight investments	3,712	2,723	1,738
Total interest income	760,448	796,804	1,004,836
Interest expense
Deposits	24,786us-gaap_InterestExpenseDeposits	34,495us-gaap_InterestExpenseDeposits	57,568us-gaap_InterestExpenseDeposits
Short-term borrowings	9,177	2,724	5,107
Long-term obligations	16,388us-gaap_InterestExpenseLongTermDebt	19,399us-gaap_InterestExpenseLongTermDebt	27,473us-gaap_InterestExpenseLongTermDebt
Total interest expense	50,351us-gaap_InterestExpense	56,618us-gaap_InterestExpense	90,148us-gaap_InterestExpense
Net interest income (loss)	710,097us-gaap_InterestIncomeExpenseNet	740,186us-gaap_InterestIncomeExpenseNet	914,688us-gaap_InterestIncomeExpenseNet
Provision for loan and lease losses	640us-gaap_ProvisionForLoanAndLeaseLosses	(32,255)us-gaap_ProvisionForLoanAndLeaseLosses	142,885us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan and lease losses	709,457	772,441	771,803
Noninterest income
Cardholder and merchant services	56,820	48,360	45,174
Merchant Discount Fees	64,075us-gaap_MerchantDiscountFees	56,024us-gaap_MerchantDiscountFees	50,298us-gaap_MerchantDiscountFees
Service charges on deposit accounts	69,100	60,661	61,564
Wealth management services	66,115us-gaap_AssetManagementFees1	59,628us-gaap_AssetManagementFees1	57,236us-gaap_AssetManagementFees1
Fees from processing services	17,989fcnca_FeesFromProcessingServices	22,821fcnca_FeesFromProcessingServices	34,816fcnca_FeesFromProcessingServices
Securities gains (losses)	29,096us-gaap_GainLossOnSaleOfSecuritiesNet	0us-gaap_GainLossOnSaleOfSecuritiesNet	2,277us-gaap_GainLossOnSaleOfSecuritiesNet
Other service charges and fees	17,760us-gaap_FeesAndCommissionsOther	15,696us-gaap_FeesAndCommissionsOther	14,239us-gaap_FeesAndCommissionsOther
Mortgage income	5,828	11,065	8,072
Insurance commissions	11,129us-gaap_InsuranceCommissionsAndFees	10,694us-gaap_InsuranceCommissionsAndFees	9,974us-gaap_InsuranceCommissionsAndFees
ATM income	5,388fcnca_AtmIncome	5,026fcnca_AtmIncome	5,279fcnca_AtmIncome
Adjustments to FDIC receivable	(32,151)fcnca_AdjustmentstoIndemnificationAsset	(72,342)fcnca_AdjustmentstoIndemnificationAsset	(101,594)fcnca_AdjustmentstoIndemnificationAsset
Other	29,277us-gaap_NoninterestIncomeOther	49,749us-gaap_NoninterestIncomeOther	4,919us-gaap_NoninterestIncomeOther
Total noninterest income	340,426us-gaap_NoninterestIncome	267,382us-gaap_NoninterestIncome	192,254us-gaap_NoninterestIncome
Noninterest expense
Salaries and wages	349,279	308,936	307,036
Employee benefits	79,898us-gaap_OtherLaborRelatedExpenses	90,479us-gaap_OtherLaborRelatedExpenses	78,861us-gaap_OtherLaborRelatedExpenses
Occupancy expense	86,775us-gaap_OccupancyNet	75,713us-gaap_OccupancyNet	74,798us-gaap_OccupancyNet
Equipment expense	79,084us-gaap_EquipmentExpense	75,538us-gaap_EquipmentExpense	74,822us-gaap_EquipmentExpense
FDIC insurance expense	12,979	10,175	10,656
Foreclosure-related expenses	17,368us-gaap_ForeclosedRealEstateExpense	17,134us-gaap_ForeclosedRealEstateExpense	40,654us-gaap_ForeclosedRealEstateExpense
Merger-related expenses	13,064	391	791
Other	207,842us-gaap_OtherNoninterestExpense	193,014us-gaap_OtherNoninterestExpense	179,315us-gaap_OtherNoninterestExpense
Total noninterest expense	846,289us-gaap_NoninterestExpense	771,380us-gaap_NoninterestExpense	766,933us-gaap_NoninterestExpense
Income before income taxes	203,594	268,443	197,124
Income taxes	65,032us-gaap_IncomeTaxExpenseBenefit	101,574us-gaap_IncomeTaxExpenseBenefit	64,729us-gaap_IncomeTaxExpenseBenefit
Income taxes	98,371us-gaap_CurrentIncomeTaxExpenseBenefit	53,928us-gaap_CurrentIncomeTaxExpenseBenefit	99,151us-gaap_CurrentIncomeTaxExpenseBenefit
Net income	$ 138,562us-gaap_NetIncomeLoss	$ 166,869us-gaap_NetIncomeLoss	$ 132,395us-gaap_NetIncomeLoss
Average shares outstanding (in shares)	10,221,721	9,618,952	10,244,472
Cash dividends (in dollars per share)	$ 1.20	$ 1.20	$ 1.20
Net income per share	$ 13.56us-gaap_EarningsPerShareBasic	$ 17.35us-gaap_EarningsPerShareBasic	$ 12.92us-gaap_EarningsPerShareBasic

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Aggregate amount of interest paid or due on all long-term debt.

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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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The net amount of operating interest income (expense).

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securitized, pass-through debt securities collateralized by real estate mortgage loans.

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Interest income on securities issued by US government agencies not including US Treasury Securities.

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Interest income, including any amortization and accretion (as applicable) of discounts and premiums, derived from debt securities issued by municipal governments, local taxing districts and US state government agencies.

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Interest income on US treasury securities. US treasury securities are negotiable debt obligations of the US government, secured by its full faith and credit and issued at various schedules and maturities. The income from treasury securities is exempt from state and local, but not federal, taxes. There are three types of securities issued by the US treasury (bonds, bills, and notes), which are distinguished by the amount of time from the initial sale of the bond to maturity.

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Amount of earnings on fees charged to merchants for the cardholder's use of a credit card. Excludes interest income earned on credit card balances, transactions and credit card services including late, over limit, and annual fees.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total aggregate amount of all noninterest expense.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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Other noninterest expenses that are not separately presented in any other noninterest expense category.

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Amount of expense related to estimated loss from loan and lease transactions.

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Expenditures for salaries for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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