CONSOLIDATED STATEMENTS OF INCOME (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans receivable	$ 27,496,000	$ 24,890,000
Loans held for sale	2,484,000	2,477,000
Federal funds sold	28,000us-gaap_InterestIncomeFederalFundsSold	31,000us-gaap_InterestIncomeFederalFundsSold
Investment securities available-for-sale	2,715,000	3,085,000
Investment securities held-to-maturity	21,000	39,000
Other investments	156,000	138,000
Total interest income	32,900,000	30,660,000
Interest expense:
Deposits	3,486,000us-gaap_InterestExpenseDeposits	2,821,000us-gaap_InterestExpenseDeposits
Other borrowed funds	1,975,000us-gaap_InterestExpenseOther	2,172,000us-gaap_InterestExpenseOther
Total interest expense	5,461,000us-gaap_InterestExpense	4,993,000us-gaap_InterestExpense
Net interest income	27,439,000us-gaap_InterestIncomeExpenseNet	25,667,000us-gaap_InterestIncomeExpenseNet
Provision for loan losses	130,000us-gaap_ProvisionForLoanAndLeaseLosses	1,926,000us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	27,309,000	23,741,000
Non-interest income:
Service charges on deposit accounts	544,000	535,000
Loan fees	454,000cfnl_LoanFees	212,000cfnl_LoanFees
Investment fee income	115,000	222,000
Realized and unrealized gains on mortgage banking activities	16,166,000us-gaap_GainLossOnSaleOfMortgageLoans	7,383,000us-gaap_GainLossOnSaleOfMortgageLoans
Net realized gain on investment securities-trading		169,000
Net realized gain (loss) on investment securities-available for sale	202,000	(17,000)
Management fee income		21,000cfnl_ManagementFee
Increase in cash surrender value of bank-owned life insurance	118,000us-gaap_BankOwnedLifeInsuranceIncome	119,000us-gaap_BankOwnedLifeInsuranceIncome
Other income	5,000	24,000
Total non-interest income	17,604,000us-gaap_NoninterestIncome	8,668,000us-gaap_NoninterestIncome
Non-interest expense:
Salary and benefits	12,081,000us-gaap_LaborAndRelatedExpense	11,389,000us-gaap_LaborAndRelatedExpense
Occupancy	2,484,000us-gaap_OccupancyNet	2,630,000us-gaap_OccupancyNet
Professional fees	1,589,000us-gaap_ProfessionalFees	818,000us-gaap_ProfessionalFees
Depreciation	876,000us-gaap_DepreciationNonproduction	966,000us-gaap_DepreciationNonproduction
Data processing & communications	1,504,000	1,615,000
FDIC insurance premiums	516,000	383,000
Merger and acquisition expense	468,000	3,212,000
Amortization of intangibles	197,000us-gaap_AmortizationOfIntangibleAssets	200,000us-gaap_AmortizationOfIntangibleAssets
Other operating expenses	4,428,000us-gaap_OtherNoninterestExpense	4,577,000us-gaap_OtherNoninterestExpense
Total non-interest expense	24,143,000us-gaap_NoninterestExpense	25,790,000us-gaap_NoninterestExpense
Income before income taxes	20,770,000	6,619,000
Provision for income taxes	7,038,000us-gaap_IncomeTaxExpenseBenefit	2,329,000us-gaap_IncomeTaxExpenseBenefit
Net income	$ 13,732,000	$ 4,290,000
Earnings per common share - basic	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic
Earnings per common share - diluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted
Weighted-average common shares outstanding - basic	32,635	32,127
Weighted-average common shares outstanding - diluted	33,071	32,609

Fee income from loans receivable held for investment.

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This element represents the fees earned during the period for the management and operational support provided to other mortgage banking companies (the "managed companies") owned by local homebuilders.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. 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.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity securities.

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Amount of other operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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The amount of interest and fee income earned from loans held-for-sale, including mortgage loans, and interest earned from direct financing and sales-type leases held-for-sale.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Aggregate amount of interest expense on all deposits.

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The net amount of operating interest income (expense).

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Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans generally are of short-duration (overnight).

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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 other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.

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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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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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

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This item represents the gain (loss) realized during the period from the sale of trading securities.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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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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