$COLB
Columbia Banking System Inc Stock $colb

$colb Overview Financials Valuation SEC Filings Company Website

2012 Q1 Form 10-Q Financial Statement

#000088734312000020 Filed on May 07, 2012

Income Statement

Concept	2012 Q1	2011 Q1
Revenue	$69.71M	$54.61M
YoY Change	27.65%	23.31%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$2.213M	$1.924M
YoY Change	15.02%
% of Gross Profit
Depreciation & Amortization	$16.10M	$3.800M
YoY Change	323.68%	31.03%
% of Gross Profit
Operating Expenses	$2.213M	$1.924M
YoY Change	15.02%
Operating Profit
YoY Change
Interest Expense	$2.649M	$4.162M
YoY Change	-36.35%	-30.78%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$12.10M	$8.106M
YoY Change	49.27%	3.26%
Income Tax	$3.198M	$2.327M
% Of Pretax Income	26.43%	28.71%
Net Earnings	$8.902M	$5.779M
YoY Change	54.04%	-27.0%
Net Earnings / Revenue	12.77%	10.58%
Basic Earnings Per Share	$0.22	$0.15
Diluted Earnings Per Share	$0.22	$0.15
COMMON SHARES
Basic Shares Outstanding	39.20M shares	39.04M shares
Diluted Shares Outstanding	39.30M shares	39.16M shares

Balance Sheet

Concept	2012 Q1	2011 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$391.5M	$476.3M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$113.1M	$94.00M
YoY Change	20.29%	51.61%
Goodwill	$115.6M	$109.6M
YoY Change	5.39%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$4.815B	$4.264B
YoY Change	12.93%	3.14%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$25.00M	$25.00M
YoY Change	0.0%	0.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$25.00M	$25.00M
YoY Change	0.0%	0.0%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$26.00M
YoY Change	-100.0%	0.0%
Other Long-Term Liabilities	$58.00M	$48.00M
YoY Change	20.83%	2.13%
Total Long-Term Liabilities	$58.00M	$74.00M
YoY Change	-21.62%	1.37%
TOTAL LIABILITIES
Total Short-Term Liabilities	$25.00M	$25.00M
Total Long-Term Liabilities	$58.00M	$74.00M
Total Liabilities	$4.063B	$3.550B
YoY Change	14.44%	-1.25%
SHAREHOLDERS EQUITY
Retained Earnings	$149.3M
YoY Change
Common Stock	$579.9M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$752.7M	$714.1M
YoY Change
Total Liabilities & Shareholders Equity	$4.815B	$4.264B
YoY Change	12.93%	3.14%

Cashflow Statement

Concept	2012 Q1	2011 Q1
OPERATING ACTIVITIES
Net Income	$8.902M	$5.779M
YoY Change	54.04%	-27.0%
Depreciation, Depletion And Amortization	$16.10M	$3.800M
YoY Change	323.68%	31.03%
Cash From Operating Activities	$35.38M	$19.66M
YoY Change	79.97%	-30.77%
INVESTING ACTIVITIES
Capital Expenditures	$6.682M	$2.461M
YoY Change	171.52%	-920.33%
Acquisitions
YoY Change
Other Investing Activities	$37.20M	-$58.80M
YoY Change	-163.27%	-122.34%
Cash From Investing Activities	$30.39M	-$61.53M
YoY Change	-149.39%	-123.41%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00	$32.00K
YoY Change	-100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$31.39M	$4.071M
YoY Change	671.09%	-101.4%
NET CHANGE
Cash From Operating Activities	$35.38M	$19.66M
Cash From Investing Activities	$30.39M	-$61.53M
Cash From Financing Activities	$31.39M	$4.071M
Net Change In Cash	$97.17M	-$37.80M
YoY Change	-357.04%	-3007.85%
FREE CASH FLOW
Cash From Operating Activities	$35.38M	$19.66M
Capital Expenditures	$6.682M	$2.461M
Free Cash Flow	$28.70M	$17.20M
YoY Change	66.88%	-40.07%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	155069000	USD
CY2012Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	149348000	USD
CY2012Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	23461000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	25133000	USD
CY2012Q1	us-gaap	Advertising Expense AdvertisingExpense	882000	USD
CY2011Q1	us-gaap	Advertising Expense AdvertisingExpense	901000	USD
CY2011Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	984000	USD
CY2012Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1150000	USD
CY2011Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	54000	shares
CY2012Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	46000	shares
CY2012Q1	us-gaap	Assets Assets	4815432000	USD
CY2011Q4	us-gaap	Assets Assets	4785945000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1028110000	USD
CY2012Q1	us-gaap	Available For Sale Securities AvailableForSaleSecurities	999213000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	987560000	USD
CY2012Q1	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	961296000	USD
CY2012Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	203068000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	244811000	USD
CY2012Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	189104000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	242695000	USD
CY2012Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	13964000	USD
CY2011Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	2116000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	190442000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	199359000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	78072000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	80627000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	667044000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	693153000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	958000000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	22442000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	22749000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	995888000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	1028110000	USD
CY2012Q1	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	999213000	USD
CY2012Q1	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	62000	USD
CY2011Q1	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	0	USD
CY2012Q1	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	1609000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	2088000	USD
CY2012Q1	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	403549000	USD
CY2012Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses1	156000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses1	65000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	2088000	USD
CY2012Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses1	1609000	USD
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	2023000	USD
CY2012Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses1 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses1	1453000	USD
CY2012Q1	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	39526000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	42638000	USD
CY2011Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	91364000	USD
CY2011Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	259669000	USD
CY2010Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	256572000	USD
CY2012Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	239677000	USD
CY2011Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	217351000	USD
CY2012Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	711000	USD
CY2011Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	505000	USD
CY2012Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	391457000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	294289000	USD
CY2011Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	476328000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	514130000	USD
CY2011Q1	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-37802000	USD
CY2012Q1	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	97168000	USD
CY2012Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	93904000	USD
CY2011Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	21303000	USD
CY2012Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	27658000	USD
CY2012Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	1799000	USD
CY2011Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	3159000	USD
CY2011Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	-14759000	USD
CY2012Q1	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	9465000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.37
CY2011Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.03
CY2012Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2012Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2011Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue
CY2012Q1	us-gaap	Common Stock No Par Value CommonStockNoParValue
CY2012Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	63033000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	63033000	shares
CY2012Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	39670000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	39506000	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39506000	shares
CY2012Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39670000	shares
CY2012Q1	us-gaap	Common Stock Value CommonStockValue	579894000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	579136000	USD
CY2011Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	1924000	USD
CY2012Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	2213000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	7230000	USD
CY2011Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	7703000	USD
CY2011Q4	us-gaap	Deposits Deposits	3815529000	USD
CY2012Q1	us-gaap	Deposits Deposits	3865445000	USD
CY2011Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3774000	USD
CY2012Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	16141000	USD
CY2012Q1	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Accounting Pronouncements Recently Issued</font></div><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In May 2011, the Financial Accounting Standards Board ("FASB") issued ASU 2011-04, </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. Generally Accepted Accounting Principles </font><font style="font-family:inherit;font-size:10pt;">(“GAAP”)</font><font style="font-family:inherit;font-size:10pt;font-style:italic;"> and International Financial Reporting Standards </font><font style="font-family:inherit;font-size:10pt;">(“IFRS”) (Topic 820). ASU 2011-04 developed common requirements between GAAP and IFRS for measuring fair value and for disclosing information about fair value measurements. The Company adopted this ASU during the current period with no impact on the Company's financial condition or results of operations.</font></div></div>
CY2011Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1181000	USD
CY2012Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	14623000	USD
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2012Q1	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	860000	USD
CY2011Q1	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2195000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	119009000	USD
CY2012Q1	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	114715000	USD
CY2011Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	22215000	USD
CY2012Q1	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	22215000	USD
CY2011Q1	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	6288000	USD
CY2012Q1	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	7177000	USD
CY2011Q1	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	1633000	USD
CY2012Q1	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	2018000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	20166000	USD
CY2012Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	19016000	USD
CY2012Q1	us-gaap	Future Amortization Expense Year Five FutureAmortizationExpenseYearFive	2184000	USD
CY2012Q1	us-gaap	Future Amortization Expense Year Four FutureAmortizationExpenseYearFour	2645000	USD
CY2012Q1	us-gaap	Future Amortization Expense Year One FutureAmortizationExpenseYearOne	3295000	USD
CY2012Q1	us-gaap	Future Amortization Expense Year Three FutureAmortizationExpenseYearThree	3397000	USD
CY2012Q1	us-gaap	Future Amortization Expense Year Two FutureAmortizationExpenseYearTwo	3964000	USD
CY2012Q1	us-gaap	Gain From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness GainFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectiveness	0	USD
CY2011Q1	us-gaap	Gain From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness GainFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectiveness	222000	USD
CY2012Q1	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	21000	USD
CY2011Q1	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	3000	USD
CY2012Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2954000	USD
CY2011Q1	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2712000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	115554000	USD
CY2012Q1	us-gaap	Goodwill Goodwill	115554000	USD
CY2011Q1	us-gaap	Goodwill Goodwill	109639000	USD
CY2012Q1	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	3127000	USD
CY2011Q1	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	1925000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12100000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	8106000	USD
CY2011Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2327000	USD
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3198000	USD
CY2011Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	0	USD
CY2012Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	0	USD
CY2011Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	8944000	USD
CY2012Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	49916000	USD
CY2011Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	1725000	USD
CY2012Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	750000	USD
CY2011Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-251000	USD
CY2012Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-148000	USD
CY2011Q1	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	-212000	USD
CY2012Q1	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	-82000	USD
CY2011Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-13736000	USD
CY2012Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1166000	USD
CY2011Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-766000	USD
CY2012Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-8403000	USD
CY2012Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	69712000	USD
CY2011Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	54611000	USD
CY2011Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	47429000	USD
CY2012Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	61777000	USD
CY2012Q1	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	2706137000	USD
CY2011Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	2658919000	USD
CY2011Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	202925000	USD
CY2012Q1	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	297553000	USD
CY2011Q1	us-gaap	Interest Expense InterestExpense	4162000	USD
CY2012Q1	us-gaap	Interest Expense InterestExpense	2649000	USD
CY2011Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3079000	USD
CY2012Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	1779000	USD
CY2012Q1	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	750000	USD
CY2011Q1	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	694000	USD
CY2012Q1	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	0	USD
CY2011Q1	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	251000	USD
CY2011Q1	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	138000	USD
CY2012Q1	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	120000	USD
CY2011Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	50871000	USD
CY2012Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	46878000	USD
CY2012Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	67063000	USD
CY2011Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	50449000	USD
CY2012Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	2525000	USD
CY2011Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	2467000	USD
CY2012Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	5245000	USD
CY2011Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	4417000	USD
CY2012Q1	us-gaap	Interest Paid Net InterestPaidNet	2797000	USD
CY2011Q1	us-gaap	Interest Paid Net InterestPaidNet	4413000	USD
CY2012Q1	us-gaap	Interest Receivable InterestReceivable	16037000	USD
CY2011Q4	us-gaap	Interest Receivable InterestReceivable	15287000	USD
CY2012Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	21995000	USD
CY2011Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	18921000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	4026607000	USD
CY2012Q1	us-gaap	Liabilities Liabilities	4062729000	USD
CY2012Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4815432000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4785945000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	16217000	USD
CY2012Q1	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	12865000	USD
CY2012Q1	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	2821148000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	2827259000	USD
CY2012Q1	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	11700000	USD
CY2011Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	9000000	USD
CY2012Q1	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	2800000	USD
CY2012Q1	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	141000	USD
CY2011Q4	us-gaap	Loans Receivable Held For Sale Net LoansReceivableHeldForSaleNet	2148000	USD
CY2012Q1	us-gaap	Loans Receivable Held For Sale Net LoansReceivableHeldForSaleNet	2066000	USD
CY2011Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	4071000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	31391000	USD
CY2011Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-61533000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	30394000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	35383000	USD
CY2011Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	19660000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	5779000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	8902000	USD
CY2012Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1159308000	USD
CY2011Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1156610000	USD
CY2011Q1	us-gaap	Noninterest Expense NoninterestExpense	37346000	USD
CY2012Q1	colb	Diluted Earnings Allocated To Common Shareholders DilutedEarningsAllocatedToCommonShareholders	8770000	USD
CY2012Q1	colb	Earnings Allocated To Participating Securities EarningsAllocatedToParticipatingSecurities	132000	USD
CY2012Q1	us-gaap	Noninterest Expense NoninterestExpense	44352000	USD
CY2012Q1	us-gaap	Noninterest Income NoninterestIncome	9574000	USD
CY2011Q1	us-gaap	Noninterest Income NoninterestIncome	-5419000	USD
CY2011Q1	us-gaap	Noninterest Income Other NoninterestIncomeOther	929000	USD
CY2012Q1	us-gaap	Noninterest Income Other NoninterestIncomeOther	1274000	USD
CY2012Q1	us-gaap	Occupancy Net OccupancyNet	5333000	USD
CY2011Q1	us-gaap	Occupancy Net OccupancyNet	4397000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	126928000	USD
CY2012Q1	us-gaap	Other Assets OtherAssets	115420000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	13000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	14000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	2313000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-1685000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	-247000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	13000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	USD
CY2011Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-261000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	0	USD
CY2011Q1	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-142000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	0	USD
CY2011Q1	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Effect Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease	79000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Tax Effect OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicPensionCostTaxEffect	-7000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Tax Effect OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicPensionCostTaxEffect	-8000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-1672000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	1924000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	40000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2011Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0	USD
CY2012Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	22000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	142000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	0	USD
CY2011Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2313000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1645000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1284000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-926000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	67069000	USD
CY2012Q1	us-gaap	Other Liabilities OtherLiabilities	57569000	USD
CY2011Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	5305000	USD
CY2012Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	7172000	USD
CY2012Q1	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	90000	USD
CY2011Q1	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	251000	USD
CY2011Q1	us-gaap	Payments For Federal Home Loan Bank Advances PaymentsForFederalHomeLoanBankAdvances	4140000	USD
CY2012Q1	us-gaap	Payments For Federal Home Loan Bank Advances PaymentsForFederalHomeLoanBankAdvances	4210000	USD
CY2011Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	32000	USD
CY2012Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2011Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1181000	USD
CY2012Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	14623000	USD
CY2012Q1	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	30177000	USD
CY2011Q1	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	149799000	USD
CY2012Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6682000	USD
CY2011Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2461000	USD
CY2011Q1	us-gaap	Proceeds From Federal Home Loan Bank Advances ProceedsFromFederalHomeLoanBankAdvances	100000	USD
CY2012Q1	us-gaap	Proceeds From Federal Home Loan Bank Advances ProceedsFromFederalHomeLoanBankAdvances	0	USD
CY2012Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	USD
CY2011Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	100000	USD
CY2011Q1	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	-558000	USD
CY2012Q1	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2011Q1	us-gaap	Proceeds From Loan And Lease Originations And Principal Collections ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections	-51870000	USD
CY2012Q1	us-gaap	Proceeds From Loan And Lease Originations And Principal Collections ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections	16814000	USD
CY2012Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	49654000	USD
CY2011Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	27315000	USD
CY2011Q1	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	0	USD
CY2012Q1	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	3845000	USD
CY2011Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	5372000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	7829000	USD
CY2011Q1	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	20000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2011Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	380000	USD
CY2012Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	308000	USD
CY2011Q1	us-gaap	Professional Fees ProfessionalFees	1413000	USD
CY2012Q1	us-gaap	Professional Fees ProfessionalFees	1609000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	107899000	USD
CY2012Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	113071000	USD
CY2011Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-422000	USD
CY2012Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	20185000	USD
CY2012Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	41174000	USD
CY2011Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	51019000	USD
CY2011Q1	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	100000	USD
CY2012Q1	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	0	USD
CY2011Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	25000000	USD
CY2012Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	25000000	USD
CY2011Q1	us-gaap	Share Based Compensation ShareBasedCompensation	335000	USD
CY2012Q1	us-gaap	Share Based Compensation ShareBasedCompensation	450000	USD
CY2012Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	450000	USD
CY2011Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	335000	USD
CY2011Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	380000	USD
CY2012Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	308000	USD
CY2011Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	32000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	759338000	USD
CY2012Q1	us-gaap	Stockholders Equity StockholdersEquity	752703000	USD
CY2011Q1	us-gaap	Stockholders Equity StockholdersEquity	714083000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	706878000	USD
CY2011Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	113000	shares
CY2012Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	103000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39298000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39156000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39043000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39195000	shares
CY2012Q1	colb	Allowance For Loan And Lease Losses Net Changes In Unfunded Commitments And Letters Of Credit Allowance AllowanceForLoanAndLeaseLossesNetChangesInUnfundedCommitmentsAndLettersOfCreditAllowance	130000	USD
CY2011Q1	colb	Allowance For Loan And Lease Losses Net Changes In Unfunded Commitments And Letters Of Credit Allowance AllowanceForLoanAndLeaseLossesNetChangesInUnfundedCommitmentsAndLettersOfCreditAllowance	495000	USD
CY2010Q4	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	1165000	USD
CY2012Q1	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	1665000	USD
CY2011Q1	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	1660000	USD
CY2011Q4	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	1535000	USD
CY2012Q1	colb	Amount Of Estimated Clawback Liability AmountOfEstimatedClawbackLiability	3600000	USD
CY2011Q1	colb	Basic Earnings Allocated To Common Shareholders BasicEarningsAllocatedToCommonShareholders	5726000	USD
CY2012Q1	colb	Basic Earnings Allocated To Common Shareholders BasicEarningsAllocatedToCommonShareholders	8770000	USD
CY2012Q1	colb	Change In Federal Deposit Insurance Corporation Loss Sharing Asset ChangeInFederalDepositInsuranceCorporationLossSharingAsset	-1668000	USD
CY2011Q1	colb	Change In Federal Deposit Insurance Corporation Loss Sharing Asset ChangeInFederalDepositInsuranceCorporationLossSharingAsset	-14774000	USD
CY2012Q1	colb	Clawback Percentage Of Calculated Excess Amount ClawbackPercentageOfCalculatedExcessAmount	0.50
CY2011Q1	colb	Diluted Earnings Allocated To Common Shareholders DilutedEarningsAllocatedToCommonShareholders	5726000	USD
CY2011Q1	colb	Earnings Allocated To Participating Securities EarningsAllocatedToParticipatingSecurities	53000	USD
CY2012Q1	colb	Fdic Reimbursement On Loss Sharing Asset FDICReimbursementOnLossSharingAsset	14804000	USD
CY2011Q1	colb	Fdic Reimbursement On Loss Sharing Asset FDICReimbursementOnLossSharingAsset	0	USD
CY2011Q1	colb	Fdic Loss Sharing Asset FdicLossSharingAsset	193053000	USD
CY2010Q4	colb	Fdic Loss Sharing Asset FdicLossSharingAsset	205991000	USD
CY2011Q4	colb	Fdic Loss Sharing Asset FdicLossSharingAsset	175071000	USD
CY2012Q1	colb	Fdic Loss Sharing Asset FdicLossSharingAsset	159061000	USD
CY2012Q1	colb	Fdic Loss Sharing Asset Amortization Net FdicLossSharingAssetAmortizationNet	-13873000	USD
CY2011Q1	colb	Fdic Loss Sharing Asset Amortization Net FdicLossSharingAssetAmortizationNet	-13569000	USD
CY2012Q1	colb	Fdic Loss Sharing Asset Cash Payments Received FdicLossSharingAssetCashPaymentsReceived	14804000	USD
CY2011Q1	colb	Fdic Loss Sharing Asset Cash Payments Received FdicLossSharingAssetCashPaymentsReceived	0	USD
CY2012Q1	colb	Fdic Loss Sharing Asset Disposals FdicLossSharingAssetDisposals	2067000	USD
CY2011Q1	colb	Fdic Loss Sharing Asset Disposals FdicLossSharingAssetDisposals	867000	USD
CY2012Q1	colb	Fdic Loss Sharing Asset Net Reimbursable Losses FdicLossSharingAssetNetReimbursableLosses	462000	USD
CY2011Q1	colb	Fdic Loss Sharing Asset Net Reimbursable Losses FdicLossSharingAssetNetReimbursableLosses	1836000	USD
CY2012Q1	colb	Fdic Loss Sharing Asset Net Write Offs FdicLossSharingAssetNetWriteOffs	-12548000	USD
CY2011Q1	colb	Fdic Loss Sharing Asset Net Write Offs FdicLossSharingAssetNetWriteOffs	338000	USD
CY2012Q1	colb	Fdic Loss Sharing Asset Other FdicLossSharingAssetOther	-1724000	USD
CY2011Q1	colb	Fdic Loss Sharing Asset Other FdicLossSharingAssetOther	0	USD
CY2012Q1	colb	Fdic Loss Sharing Asset Period Increase Decrease FdicLossSharingAssetPeriodIncreaseDecrease	12500000	USD
CY2012Q1	colb	Federal Deposit Insurance Corporation Loss Sharing Asset FederalDepositInsuranceCorporationLossSharingAsset	159061000	USD
CY2011Q4	colb	Federal Deposit Insurance Corporation Loss Sharing Asset FederalDepositInsuranceCorporationLossSharingAsset	175071000	USD
CY2012Q1	colb	Federal Deposit Insurance Corporation Loss Sharing Indemnified Assets FederalDepositInsuranceCorporationLossSharingIndemnifiedAssets	135600000	USD
CY2012Q1	colb	Federal Deposit Insurance Corporation Loss Sharing Indemnified Assets Receivable FederalDepositInsuranceCorporationLossSharingIndemnifiedAssetsReceivable	23500000	USD
CY2012Q1	colb	Financing Receivable Modifications Additional Commitment To Lend FinancingReceivableModificationsAdditionalCommitmentToLend	9500000	USD
CY2011Q4	colb	Financing Receivable Modifications Additional Commitment To Lend FinancingReceivableModificationsAdditionalCommitmentToLend	535000	USD
CY2012Q1	colb	Financing Receivable Modifications Subsequent Default Number Of Contracts FinancingReceivableModificationsSubsequentDefaultNumberOfContracts	0
CY2011Q1	colb	Goodwill And Intangible Assets Total GoodwillAndIntangibleAssetsTotal	127351000	USD
CY2012Q1	colb	Goodwill And Intangible Assets Total GoodwillAndIntangibleAssetsTotal	134570000	USD
CY2012Q1	colb	Interest Income Federal Funds Sold And Deposits In Banks InterestIncomeFederalFundsSoldAndDepositsInBanks	165000	USD
CY2011Q1	colb	Interest Income Federal Funds Sold And Deposits In Banks InterestIncomeFederalFundsSoldAndDepositsInBanks	298000	USD
CY2012Q1	colb	Merchant Processing MerchantProcessing	873000	USD
CY2011Q1	colb	Merchant Processing MerchantProcessing	883000	USD
CY2012Q1	colb	Minimum Percentage Of Stated Threshold Amount Where Clawback Calculation Begins MinimumPercentageOfStatedThresholdAmountWhereClawbackCalculationBegins	0.20
CY2012Q1	colb	Net Cost Of Operation Of Other Real Estate NetCostOfOperationOfOtherRealEstate	910000	USD
CY2011Q1	colb	Net Cost Of Operation Of Other Real Estate NetCostOfOperationOfOtherRealEstate	-442000	USD
CY2012Q1	colb	Net Unrealized Gain Loss From Unfunded Defined Benefit Plan Liability Arising During Period Tax NetUnrealizedGainLossFromUnfundedDefinedBenefitPlanLiabilityArisingDuringPeriodTax	0	USD
CY2011Q1	colb	Net Unrealized Gain Loss From Unfunded Defined Benefit Plan Liability Arising During Period Tax NetUnrealizedGainLossFromUnfundedDefinedBenefitPlanLiabilityArisingDuringPeriodTax	-154000	USD
CY2012Q1	colb	Payment Of Clawback If Losses Less Than Stated Levels Period After Acquisition PaymentOfClawbackIfLossesLessThanStatedLevelsPeriodAfterAcquisition	P10Y45D
CY2012Q1	colb	Percentage Of Asset Premium Discount Used In Clawback Calculation PercentageOfAssetPremiumDiscountUsedInClawbackCalculation	0.25
CY2012Q1	colb	Proceeds From Sales Of Covered Other Real Estate Owned ProceedsFromSalesOfCoveredOtherRealEstateOwned	8025000	USD
CY2011Q1	colb	Proceeds From Sales Of Covered Other Real Estate Owned ProceedsFromSalesOfCoveredOtherRealEstateOwned	6959000	USD
CY2012Q2	colb	Special Dividends Payable Amount Per Share SpecialDividendsPayableAmountPerShare	0.14
CY2012Q1	colb	Special Dividends Payable Amount Per Share SpecialDividendsPayableAmountPerShare	0.29
CY2012Q1	colb	Taxes Licenses And Fees TaxesLicensesAndFees	1355000	USD
CY2011Q1	colb	Taxes Licenses And Fees TaxesLicensesAndFees	865000	USD
CY2011Q1	colb	Transfer From Loans To Foreclosed Assets TransferFromLoansToForeclosedAssets	5467000	USD
CY2012Q1	colb	Transfer From Loans To Foreclosed Assets TransferFromLoansToForeclosedAssets	6092000	USD
CY2012Q1	dei	Amendment Flag AmendmentFlag	false
CY2012Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2012Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012Q1	dei	Document Period End Date DocumentPeriodEndDate	2012-03-31
CY2012Q1	dei	Document Type DocumentType	10-Q
CY2012Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000887343
CY2012Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	39674650	shares
CY2012Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q1	dei	Entity Registrant Name EntityRegistrantName	COLUMBIA BANKING SYSTEM INC

Files In Submission

Name	View Source	Status
0000887343-12-000020-index-headers.html	Edgar Link	pending
0000887343-12-000020-index.html	Edgar Link	pending
0000887343-12-000020.txt	Edgar Link	pending
0000887343-12-000020-xbrl.zip	Edgar Link	pending
colb-20120331.xml	Edgar Link	completed
colb-20120331.xsd	Edgar Link	pending
colb-20120331_cal.xml	Edgar Link	unprocessable
colb-20120331_def.xml	Edgar Link	unprocessable
colb-20120331_lab.xml	Edgar Link	unprocessable
colb-20120331_pre.xml	Edgar Link	unprocessable
colb0331201210-q.htm	Edgar Link	pending
colb03312012ex311.htm	Edgar Link	pending
colb03312012ex312.htm	Edgar Link	pending
colb03312012ex32.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
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R5.htm	Edgar Link	pending
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R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$COLB
Columbia Banking System Inc Stock $colb

2012 Q1 Form 10-Q Financial Statement

#000088734312000020 Filed on May 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB Columbia Banking System Inc Stock $colb

2012 Q1 Form 10-Q Financial Statement

#000088734312000020 Filed on May 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB
Columbia Banking System Inc Stock $colb