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Share-Based Payments (Share Options) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 2,900,000us-gaap_AllocatedShareBasedCompensationExpense $ 2,800,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,600,000us-gaap_AllocatedShareBasedCompensationExpense
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Balance at beginning of year (in shares) 116,197us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 222,110us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Forfeited (in shares) (8,753)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod    
Expired (in shares) (22,330)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod    
Exercised (in shares) (9,116)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised    
Balance at end of year (in shares) 75,998us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 116,197us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Total Exercisable Shares 75,998us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Weighted Average Exercise Price at beginning of year $ 65.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Weighted Average Exercise Price, Forfeited $ 75.32us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice    
Weighted Average Exercise Price, Expired $ 91.95us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice    
Weighted Average Exercise Price, Exercised $ 12.09us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice    
Weighted Average Exercise Price at end of year $ 62.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 65.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Exercisable, Weighted Average Exercise Price $ 62.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Weighted Average Remaining Contractual Term 2 years 4 months 25 days    
Aggregate Intrinsic Value 391,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 75,998us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 62.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 2 years 4 months 25 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 391,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue    
Exercisable, Weighted Average Remaining Contractual Term 2 years 4 months 25 days    
Exercisable, Aggregate Intrinsic Value 391,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 138,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 410,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Number of Option Shares 75,998us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions    
Weighted Average Remaining Contractual Life 2 years 5 months 0 days    
Weighted Average Exercise Price of Option Shares $ 62.41us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1    
Number of Exercisable Option Shares 75,998us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions    
Weighted Average Exercise Price of Exercisable Option Shares $ 62.41us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1    
Stock-based compensation expense $ 2,859,000us-gaap_ShareBasedCompensation $ 2,844,000us-gaap_ShareBasedCompensation $ 1,622,000us-gaap_ShareBasedCompensation
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 3.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 0.00 To 9.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit $ 0.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFrom1235To1543Member
   
Range of Exercise Prices, Upper Limit $ 9.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFrom1235To1543Member
   
Number of Option Shares 21,579us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFrom1235To1543Member
   
Weighted Average Remaining Contractual Life 4 years 3 months 24 days    
Weighted Average Exercise Price of Option Shares $ 9.91us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFrom1235To1543Member
   
Number of Exercisable Option Shares 21,579us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFrom1235To1543Member
   
Weighted Average Exercise Price of Exercisable Option Shares $ 9.91us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeFrom1235To1543Member
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 10.00 To 19.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit $ 10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom10.00To19.99Member
   
Range of Exercise Prices, Upper Limit $ 19.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom10.00To19.99Member
   
Number of Option Shares 600us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom10.00To19.99Member
   
Weighted Average Remaining Contractual Life 2 years 7 months 19 days    
Weighted Average Exercise Price of Option Shares $ 12.61us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom10.00To19.99Member
   
Number of Exercisable Option Shares 600us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom10.00To19.99Member
   
Weighted Average Exercise Price of Exercisable Option Shares $ 12.61us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom10.00To19.99Member
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 20.00 To 29.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit $ 20.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom20.00To29.99Member
   
Range of Exercise Prices, Upper Limit $ 29.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom20.00To29.99Member
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 30.00 To 39.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit $ 30.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom30.00To39.99Member
   
Range of Exercise Prices, Upper Limit $ 39.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom30.00To39.99Member
   
Number of Option Shares 4,051us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom30.00To39.99Member
   
Weighted Average Remaining Contractual Life 2 years 1 month 21 days    
Weighted Average Exercise Price of Option Shares $ 30.86us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom30.00To39.99Member
   
Number of Exercisable Option Shares 4,051us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom30.00To39.99Member
   
Weighted Average Exercise Price of Exercisable Option Shares $ 30.86us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom30.00To39.99Member
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 40.00 To 49.99 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit $ 40.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember
   
Range of Exercise Prices, Upper Limit $ 49.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember
   
Number of Option Shares 349us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember
   
Weighted Average Remaining Contractual Life 3 years 5 months 26 days    
Weighted Average Exercise Price of Option Shares $ 44.49us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember
   
Number of Exercisable Option Shares 349us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember
   
Weighted Average Exercise Price of Exercisable Option Shares $ 44.49us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom40.00To49.99MemberMember
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range From 50.00 To 146.41 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Abstract]      
Range of Exercise Prices, Lower Limit $ 50.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To146.41Member
   
Range of Exercise Prices, Upper Limit $ 146.41us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To146.41Member
   
Number of Option Shares 49,419us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To146.41Member
   
Weighted Average Remaining Contractual Life 1 year 7 months 6 days    
Weighted Average Exercise Price of Option Shares $ 88.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To146.41Member
   
Number of Exercisable Option Shares 49,419us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To146.41Member
   
Weighted Average Exercise Price of Exercisable Option Shares $ 88.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= colb_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeFrom50.00To146.41Member
   
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award, Exercisable Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share Based Compensation Arrangement By Share Based Payment Award, Maximum Term 10 years