Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The accounting and financial reporting policies of Umpqua Holdings Corporation conform to accounting principles generally accepted in the United States of America. The accompanying interim condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All material inter-company balances and transactions have been eliminated. The condensed consolidated financial statements have not been audited. A more detailed description of our accounting policies is included in the 2014 Annual Report filed on Form 10-K. These interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the 2014 Annual Report filed on Form 10-K. All references in this report to "Umpqua," "we," "our," "us," the "Company" or similar references mean Umpqua Holdings Corporation, and include our consolidated subsidiaries where the context so requires. References to "Bank" refer to our subsidiary Umpqua Bank, an Oregon state-chartered commercial bank, and references to "Umpqua Investments" refer to our subsidiary Umpqua Investments, Inc., a registered broker-dealer and investment adviser. The Bank also has a wholly-owned subsidiary, Financial Pacific Leasing Inc., a commercial equipment leasing company. In preparing these condensed consolidated financial statements, the Company has evaluated events and transactions subsequent to September 30, 2015 for potential recognition or disclosure. In management's opinion, all accounting adjustments necessary to accurately reflect the financial position and results of operations on the accompanying financial statements have been made. These adjustments include normal and recurring accruals considered necessary for a fair and accurate presentation. The results for interim periods are not necessarily indicative of results for the full year or any other interim period. Certain reclassifications of prior period amounts have been made to conform to current classifications. Application of new accounting guidance As of January 1, 2015, Umpqua adopted the Financial Accounting Standards Board's ("FASB") Accounting Standard Update ("ASU") No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. Application of ASU No. 2014-01 provides for a consistent accounting method for our investments in qualified affordable housing projects using a proportional amortization method. As required by ASU No. 2014-01, the new accounting methodology has been retrospectively applied resulting in changes to other non-interest income, tax expense, and net income, deferred tax asset, other assets, and retained earnings in the prior periods presented. The effect of this change was a decrease in net income of $110,000 and $330,000 for the three and nine months ended September 30, 2015, respectively. The effect of this change on the revised September 30, 2014 income statements was a decrease in net income of $107,000 for the three months ended September 30, 2014 and an increase of $102,000 for the nine months ended September 30, 2014. Retained earnings as of January 1, 2014, has been adjusted down by $3.5 million for the effect of the retroactive application of the new standard. As of January 1, 2015, Umpqua applied FASB ASU No. 2014-04, Receivables -Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 clarifies when a repossession or foreclosure has occurred. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. As of September 30, 2015, Umpqua had $2.4 million of foreclosed residential real estate property held as other real estate owned. Umpqua's recorded investment in consumer mortgage loans collateralized by residential real estate property in process of foreclosure was $4.1 million as of September 30, 2015.

Summary of Significant Accounting Policies

The accounting and financial reporting policies of Umpqua Holdings Corporation conform to accounting principles generally accepted in the United States of America. The accompanying interim condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All material inter-company balances and transactions have been eliminated. The condensed consolidated financial statements have not been audited. A more detailed description of our accounting policies is included in the 2014 Annual Report filed on Form 10-K. These interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the 2014 Annual Report filed on Form 10-K. All references in this report to "Umpqua," "we," "our," "us," the "Company" or similar references mean Umpqua Holdings Corporation, and include our consolidated subsidiaries where the context so requires. References to "Bank" refer to our subsidiary Umpqua Bank, an Oregon state-chartered commercial bank, and references to "Umpqua Investments" refer to our subsidiary Umpqua Investments, Inc., a registered broker-dealer and investment adviser. The Bank also has a wholly-owned subsidiary, Financial Pacific Leasing Inc., a commercial equipment leasing company.

In preparing these condensed consolidated financial statements, the Company has evaluated events and transactions subsequent to September 30, 2015 for potential recognition or disclosure. In management's opinion, all accounting adjustments necessary to accurately reflect the financial position and results of operations on the accompanying financial statements have been made. These adjustments include normal and recurring accruals considered necessary for a fair and accurate presentation. The results for interim periods are not necessarily indicative of results for the full year or any other interim period. Certain reclassifications of prior period amounts have been made to conform to current classifications.

Application of new accounting guidance

As of January 1, 2015, Umpqua adopted the Financial Accounting Standards Board's ("FASB") Accounting Standard Update ("ASU") No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. Application of ASU No. 2014-01 provides for a consistent accounting method for our investments in qualified affordable housing projects using a proportional amortization method. As required by ASU No. 2014-01, the new accounting methodology has been retrospectively applied resulting in changes to other non-interest income, tax expense, and net income, deferred tax asset, other assets, and retained earnings in the prior periods presented. The effect of this change was a decrease in net income of $110,000 and $330,000 for the three and nine months ended September 30, 2015, respectively. The effect of this change on the revised September 30, 2014 income statements was a decrease in net income of $107,000 for the three months ended September 30, 2014 and an increase of $102,000 for the nine months ended September 30, 2014. Retained earnings as of January 1, 2014, has been adjusted down by $3.5 million for the effect of the retroactive application of the new standard.

As of January 1, 2015, Umpqua applied FASB ASU No. 2014-04, Receivables -Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 clarifies when a repossession or foreclosure has occurred. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. As of September 30, 2015, Umpqua had $2.4 million of foreclosed residential real estate property held as other real estate owned. Umpqua's recorded investment in consumer mortgage loans collateralized by residential real estate property in process of foreclosure was $4.1 million as of September 30, 2015.