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Stock-Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
Nov. 23, 2008
Dec. 31, 1998
Stock-based Compensation        
Number of stock-based employee compensation plans 2cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans      
Total compensation cost charged against income $ 560,000us-gaap_AllocatedShareBasedCompensationExpense $ 152,000us-gaap_AllocatedShareBasedCompensationExpense    
Total income tax benefit recognized in the income statement for share-based compensation arrangements 186,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 51,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense    
Weighted average assumptions used in estimation of fair values of options        
Estimated option life 6 years 6 months 6 years 6 months    
Risk free interest rate, low end of range (as a percent) 1.73%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum 2.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum    
Term of the U.S. Treasury note on which the risk free interest rate is based 7 years      
Additional stock-based compensation information        
Total unrecognized compensation cost related to non-vested share-based compensation arrangements granted under the plans 1,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Expected weighted-average period for recognition of unrecognized compensation cost related to non-vested share-based compensation arrangements granted under the plans 2 years      
Stock options        
Stock-based Compensation        
Granted (in shares) 109,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
218,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Weighted average per share fair value of stock option grants (in dollars per share) $ 5.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
$ 5.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Weighted average assumptions used in estimation of fair values of options        
Estimated option life 6 years 6 months 6 years 6 months    
Risk free interest rate, low end of range (as a percent) 1.73%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
2.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Risk free interest rate, high end of range (as a percent) 1.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
2.34%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Expected volatility (as a percent) 36.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
37.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Expected dividend yield (as a percent) 2.46%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Stock option, number of shares        
Outstanding at the beginning of the period (in shares) 1,189,193us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Granted (in shares) 109,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
218,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Exercised (in shares) (70,574)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Forfeited (in shares) (5,150)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Outstanding at the end of the period (in shares) 1,222,719us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Options exercisable at the end of the period (in shares) 894,994us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Stock option, weighted average exercise price        
Outstanding at the beginning of the period (in dollars per share) $ 13.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Granted (in dollars per share) $ 20.04us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Exercised (in dollars per share) $ 10.80us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Forfeited (in dollars per share) $ 13.43us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Outstanding at the end of the period (in dollars per share) $ 14.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Options exercisable at the end of the period (in dollars per share) $ 13.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Stock option, weighted average remaining contractual term        
Outstanding at the end of the period 6 years 5 months 19 days      
Options exercisable at the end of the period 5 years 8 months 1 day      
Stock option, aggregate intrinsic value        
Outstanding at the end of the period (in dollars) 6,978,208us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Options exercisable at the end of the period (in dollars) 5,951,634us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Intrinsic value of options exercised (in dollars) 560,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
103,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Non-vested stock options, number of shares        
Balance at the beginning of the period (in shares) 378,550cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedNumber
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Granted (in shares) 109,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
218,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Vested (in shares) (156,425)cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Forfeited (in shares) (3,650)cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Balance at the end of the period (in shares) 327,725cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedNumber
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Non-vested stock options, weighted average grant date fair value        
Balance at the beginning of the period (in dollars per share) $ 5.56us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Granted (in dollars per share) $ 5.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
$ 5.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Vested (in dollars per share) $ 5.75cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Forfeited (in dollars per share) $ 4.97cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedForfeituresInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Balance at the end of the period (in dollars per share) $ 5.60us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
     
Additional stock-based compensation information        
The total fair value of shares that vested 900,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
667,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
   
Stock options | Director        
Stock-based Compensation        
Term 10 years      
Stock options | Employee        
Stock-based Compensation        
Term 10 years      
Increments in which the stock options vest and become fully exercisable, beginning after the first year of their service (as a percent) 20.00%cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncrementVestingRightsPercentageBeginningAfterFirstYearOfService
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= cfnl_EmployeeMember
     
Stock options | Executive officer        
Stock-based Compensation        
Term 10 years      
Increments in which the stock options vest (as a percent) 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
     
Percentage vesting of options on the date of grant 25.00%cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingRightsPercentageOnGrantDate
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
     
Number of increments in which stock options vest 3cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfIncrementalVestingRights
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
     
Stock options | Executive officer | Awards granted during the first quarter of 2014        
Stock-based Compensation        
Term 10 years      
Percentage vesting of options on the date of grant 33.00%cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingRightsPercentageOnGrantDate
/ us-gaap_AwardDateAxis
= cfnl_AwardsGrantedDuringFirstQuarterOf2014Member
/ us-gaap_AwardTypeAxis
= cfnl_EmployeeAndDirectorsStockOptionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
     
Vesting period of remaining unvested awards 2 years      
Restricted stock        
Stock-based Compensation        
Percentage vesting of options on the date of grant 33.00%cfnl_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingRightsPercentageOnGrantDate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Vesting period of remaining unvested awards 2 years      
Restricted stock, number of shares        
Granted (in shares) 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Vested (in shares) (6,663)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Balance at the end of the period (in shares) 13,337us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Restricted stock, weighted average grant date fair value        
Granted (in dollars per share) $ 20.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Vested (in dollars per share) $ 20.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Balance at the end of the period (in dollars per share) $ 20.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Additional stock-based compensation information        
The total fair value of restricted stock that vested $ 134,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Option Plan        
Stock-based Compensation        
Number of shares of common stock reserved for issuance       625,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cfnl_StockOptionPlan1999Member
Number of shares of the company's common stock available for future grants and awards     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cfnl_StockOptionPlan1999Member
 
Equity Plan        
Stock-based Compensation        
Number of shares of the company's common stock available for future grants and awards 269,918us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cfnl_EquityCompensationPlan2002Member