Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 47,129us-gaap_ProfitLoss	$ 18,651us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of investment premiums, net	5,605	4,000
Gain on sale of investment securities, net	(116)	0
Gain on sale of other real estate owned	(578)	(163)
Valuation adjustment on other real estate owned	2,392	99
Provision for loan and lease losses	12,637us-gaap_ProvisionForLoanAndLeaseLosses	5,971us-gaap_ProvisionForLoanAndLeaseLosses
Proceeds from bank owned life insurance	0	187
Change in cash surrender value of bank owned life insurance	(2,336)	(838)
Change in FDIC indemnification asset	1,286	4,840
Depreciation, amortization and accretion	11,490	4,280
Increase in mortgage servicing rights	(8,837)umpq_IncreaseInMortgageServicingRights	(2,408)umpq_IncreaseInMortgageServicingRights
Change in residential mortgage servicing rights carried at fair value	9,731	953
Change in junior subordinated debentures carried at fair value	1,358	526
Stock-based compensation	3,433us-gaap_ShareBasedCompensation	1,534us-gaap_ShareBasedCompensation
Net (increase) decrease in trading account assets	(453)	1,460
Gain on sale of loans	(34,692)us-gaap_GainLossOnSaleOfLoansAndLeases	(9,684)us-gaap_GainLossOnSaleOfLoansAndLeases
Change in loans held for sale carried at fair value	(4,875)	(324)
Origination of loans held for sale	(862,155)	(204,356)
Proceeds from sales of loans held for sale	775,309	245,405
Excess tax benefits from the exercise of stock options	(586)	(892)
Change in other assets and liabilities:
Net decrease in other assets	(329)	(678)
Net increase in other liabilities	20,253	2,077
Net cash (used) provided by operating activities	(24,334)	70,640
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(394,872)	0
Proceeds from investment securities available for sale	165,100	93,176
Proceeds from investment securities held to maturity	164	167
Redemption of restricted equity securities	2,116	737
Net loan and lease originations	(303,577)	(61,331)
Proceeds from sales of loans	79,575	22,272
Proceeds from disposals of furniture and equipment	2,318	30
Purchases of premises and equipment	(21,018)	(8,162)
Net payments to FDIC indemnification asset	(446)	(812)
Proceeds from sales of other real estate owned	5,528	1,914
Net cash (used) provided by investing activities	(465,112)	47,991
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit liabilities	331,988us-gaap_IncreaseDecreaseInDeposits	155,999us-gaap_IncreaseDecreaseInDeposits
Net increase in securities sold under agreements to repurchase	7,881	37,601
Repayment of term debt	(39,999)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Dividends paid on common stock	(33,109)us-gaap_PaymentsOfDividendsCommonStock	(16,936)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefits from stock based compensation	586	892
Proceeds from stock options exercised	22	3,112
Retirement of common stock	(2,220)	(4,614)
Net cash provided by financing activities	265,149	176,054
Net increase in cash and cash equivalents	(224,297)	294,685
Cash and cash equivalents, beginning of period	1,605,171	790,423
Cash and cash equivalents, end of period	1,380,874	1,085,108
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	16,673us-gaap_InterestPaid	9,032us-gaap_InterestPaid
Income taxes	5,936us-gaap_IncomeTaxesPaid	1,456us-gaap_IncomeTaxesPaid
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized gains on investment securities available for sale, net of taxes	7,573	4,787
Change in unrealized losses on investment securities held to maturity related to factors other than credit, net of taxes	0	10
Cash dividend declared on common stock and payable after period-end	33,126	16,947
Transfer of loans to other real estate owned	1,464us-gaap_TransferOfOtherRealEstate	1,878us-gaap_TransferOfOtherRealEstate
Transfer from FDIC indemnification asset to due from FDIC and other	1,270	(28)
Receivable from BOLI death benefits	$ 1,935umpq_ReceivablefromBOLIdeathbenefits	$ 0umpq_ReceivablefromBOLIdeathbenefits

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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Cash inflow related to a loan origination (the process when securing a mortgage for a piece of real property), lease origination, and principal collections.

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The cash flow from investments sold under the agreement to repurchase such investment.

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Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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 cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Value transferred out of real estate owned (REO) in noncash transactions.

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