Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTEREST INCOME
Interest and fees on non-covered loans	$ 763,803	$ 398,214	$ 386,812
Interest and dividends on investment securities:
Taxable	45,784us-gaap_InterestIncomeSecuritiesTaxable	34,146us-gaap_InterestIncomeSecuritiesTaxable	59,078us-gaap_InterestIncomeSecuritiesTaxable
Exempt from federal income tax	10,345	8,898	9,184
Dividends	325us-gaap_DividendIncomeOperating	252us-gaap_DividendIncomeOperating	83us-gaap_DividendIncomeOperating
Interest on temporary investments and interest bearing deposits	2,264us-gaap_OtherInterestAndDividendIncome	1,336us-gaap_OtherInterestAndDividendIncome	928us-gaap_OtherInterestAndDividendIncome
Total interest income	822,521	442,846	456,085
INTEREST EXPENSE
Interest on deposits	23,815us-gaap_InterestExpenseDeposits	20,755us-gaap_InterestExpenseDeposits	31,133us-gaap_InterestExpenseDeposits
Interest on securities sold under agreement to repurchase and federal funds purchased	346	141	288
Interest on term debt	12,793umpq_InterestOnTermDebt	9,248umpq_InterestOnTermDebt	9,279umpq_InterestOnTermDebt
Interest on junior subordinated debentures	11,739	7,737	8,149
Total interest expense	48,693us-gaap_InterestExpense	37,881us-gaap_InterestExpense	48,849us-gaap_InterestExpense
Net interest income	773,828us-gaap_InterestIncomeExpenseNet	404,965us-gaap_InterestIncomeExpenseNet	407,236us-gaap_InterestIncomeExpenseNet
PROVISION FOR NON-COVERED LOAN AND LEASE LOSSES	40,241us-gaap_ProvisionForLoanAndLeaseLosses	10,716us-gaap_ProvisionForLoanAndLeaseLosses	29,201us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan and lease losses	733,587	394,249	378,035
NON-INTEREST INCOME
Service charges on deposit accounts	54,700	30,952	28,299
Brokerage commissions and fees	18,133us-gaap_BrokerageCommissionsRevenue	14,736us-gaap_BrokerageCommissionsRevenue	12,967us-gaap_BrokerageCommissionsRevenue
Residential mortgage banking revenue, net	77,265umpq_MortgageBankingRevenueNet	78,885umpq_MortgageBankingRevenueNet	84,216umpq_MortgageBankingRevenueNet
Gain on investment securities, net	2,904us-gaap_MarketableSecuritiesGainLoss	209us-gaap_MarketableSecuritiesGainLoss	3,868us-gaap_MarketableSecuritiesGainLoss
Gain on loan sales	15,113us-gaap_GainLossOnSalesOfLoansNet	2,744us-gaap_GainLossOnSalesOfLoansNet	0us-gaap_GainLossOnSalesOfLoansNet
Loss on junior subordinated debentures carried at fair value	(5,090)	(2,197)	(2,203)
Change in FDIC indemnification asset	(15,151)	(25,549)	(15,234)
Bank Owned Life Insurance Income	6,835us-gaap_BankOwnedLifeInsuranceIncome	3,035us-gaap_BankOwnedLifeInsuranceIncome	2,708us-gaap_BankOwnedLifeInsuranceIncome
Other income	24,583	18,626	22,208
Total non-interest income	179,292us-gaap_NoninterestIncome	121,441us-gaap_NoninterestIncome	136,829us-gaap_NoninterestIncome
NON-INTEREST EXPENSE
Salaries and employee benefits	355,379us-gaap_LaborAndRelatedExpense	209,991us-gaap_LaborAndRelatedExpense	200,946us-gaap_LaborAndRelatedExpense
Net occupancy and equipment	111,263us-gaap_OccupancyNet	62,067us-gaap_OccupancyNet	55,081us-gaap_OccupancyNet
Communications	14,728us-gaap_Communication	11,974us-gaap_Communication	11,573us-gaap_Communication
Marketing	9,504us-gaap_MarketingExpense	6,062us-gaap_MarketingExpense	5,064us-gaap_MarketingExpense
Services	49,086us-gaap_ProfessionalFees	25,483us-gaap_ProfessionalFees	25,823us-gaap_ProfessionalFees
FDIC assessments	10,998	6,954	7,308
Net loss on other real estate owned	4,116	1,248	12,655
Intangible amortization	10,207us-gaap_AmortizationOfIntangibleAssets	4,781us-gaap_AmortizationOfIntangibleAssets	4,816us-gaap_AmortizationOfIntangibleAssets
Merger related expenses	82,317	8,836	2,338
Other expenses	36,465us-gaap_OtherNoninterestExpense	27,265us-gaap_OtherNoninterestExpense	34,048us-gaap_OtherNoninterestExpense
Total non-interest expense	684,063us-gaap_NoninterestExpense	364,661us-gaap_NoninterestExpense	359,652us-gaap_NoninterestExpense
Income before income taxes	228,816	151,029	155,212
Provision for income taxes	81,296us-gaap_IncomeTaxExpenseBenefit	52,668us-gaap_IncomeTaxExpenseBenefit	53,321us-gaap_IncomeTaxExpenseBenefit
Net income	147,520us-gaap_ProfitLoss	98,361us-gaap_ProfitLoss	101,891us-gaap_ProfitLoss
Net earnings available to common shareholders	484	788	682
Net earnings available to common shareholders	$ 147,036	$ 97,573	$ 101,209
Earnings per common share:
Basic earnings per common share (usd per share)	$ 0.79us-gaap_EarningsPerShareBasic	$ 0.87us-gaap_EarningsPerShareBasic	$ 0.90us-gaap_EarningsPerShareBasic
Diluted earnings per common share (usd per share)	$ 0.78us-gaap_EarningsPerShareDiluted	$ 0.87us-gaap_EarningsPerShareDiluted	$ 0.90us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding:
Basic (in shares)	186,550	111,938	111,935
Diluted (in shares)	187,544	112,176	112,151

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Aggregate amount of interest expense on all deposits.

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The aggregate expense incurred on federal funds purchased and securities sold under agreements to repurchase. If amounts recognized as payables under repurchase agreements have been offset against amounts recognized as receivables under reverse repurchase agreements and reported as a net amount on the balance sheet, the income and expense from these agreements may be reported on a net basis.

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Interest expense incurred during the reporting period on junior subordinated debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

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

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The net amount of operating interest income (expense).

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

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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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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. 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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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

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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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Includes all other interest income, net of discount accretion and premium amortization, and dividend income. It may include dividend income from equity securities that do not have readily determinable fair values that are reportable in Other Assets, and interest income on interest-only strips receivable (not in the form of a security) that are included in Other Assets.

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

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Aggregate of earnings distributed and earnings allocated to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.

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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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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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

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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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