Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2016
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 2015 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 2015 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. Pivotus Ventures, Inc., a wholly-owned subsidiary of Umpqua Holdings Corporation, focuses on advancing bank innovation by developing new bank platforms that could have a significant impact on the experience and economics of banking. In preparing these condensed consolidated financial statements, the Company has evaluated events and transactions subsequent to June 30, 2016 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. In the second quarter of 2016, the loan portfolio was analyzed for correct classification of certain commercial and commercial real estate loan types, as a result of this analysis, loan classifications were updated in the current period. The prior period loan classifications have been updated to be comparable to the current period presentation in note 3 -Loans and Leases and note 4 -Allowance for Loan and Lease Losses and Credit Quality. During the first quarter of 2016, Umpqua identified an error related to the accounting for loans sold to Ginnie Mae (“GNMA”) that have become past due 90 days or more. Pursuant to GNMA purchase and sales agreements, Umpqua has the unilateral right to repurchase loans that become past due 90 days or more. As a result of this unilateral right, once the delinquency criteria has been met, and regardless of whether the repurchase option has been exercised, the loan should be recognized, with an offsetting liability, to account for these loans that no longer meet the true-sale criteria. The Company has continued to grow the portfolio of GNMA loans sold and serviced, which has led to an increasing number and amount of delinquent loans. As such, the Company has recorded an adjustment to record the balance of the GNMA loans sold and serviced that are over 90 days past due, but not repurchased, as loans, with a corresponding other liability. Management evaluated the materiality of the error from qualitative and quantitative perspectives and concluded that the error was immaterial to the prior period financial statements taken as a whole. To provide consistency in the amounts reported in the comparable periods, the Company has recognized the delinquent GNMA loans for which the Company has the unconditional repurchase option, as well as the corresponding other liability, for the periods reported. As of December 31, 2015, this change resulted in an increase in loans and leases, net loans and leases, total assets, other liabilities, and total liabilities of $19.2 million. This change did not affect net income or shareholders' equity for any period. Application of new accounting guidance As of April 1, 2016, Umpqua adopted the Financial Accounting Standards Board's (FASB) Accounting Standard Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09, seeks to simplify several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. As required by ASU 2016-09, all adjustments are reflected as of the beginning of the fiscal year, January 1, 2016. By applying this ASU, the Company no longer adjusts common stock for the tax impact of shares released, instead the tax impact is recognized as tax expense in the period the shares are released. This simplifies the tracking of the excess tax benefits and deficiencies, but could cause volatility in tax expense for the periods presented. The statement of cash flows has been adjusted to reflect the provisions of this ASU. The application of this ASU did not have a material impact on the financial statements.

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 2015 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 2015 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. Pivotus Ventures, Inc., a wholly-owned subsidiary of Umpqua Holdings Corporation, focuses on advancing bank innovation by developing new bank platforms that could have a significant impact on the experience and economics of banking.

In preparing these condensed consolidated financial statements, the Company has evaluated events and transactions subsequent to June 30, 2016 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. In the second quarter of 2016, the loan portfolio was analyzed for correct classification of certain commercial and commercial real estate loan types, as a result of this analysis, loan classifications were updated in the current period. The prior period loan classifications have been updated to be comparable to the current period presentation in note 3 -Loans and Leases and note 4 -Allowance for Loan and Lease Losses and Credit Quality.

During the first quarter of 2016, Umpqua identified an error related to the accounting for loans sold to Ginnie Mae (“GNMA”) that have become past due 90 days or more. Pursuant to GNMA purchase and sales agreements, Umpqua has the unilateral right to repurchase loans that become past due 90 days or more. As a result of this unilateral right, once the delinquency criteria has been met, and regardless of whether the repurchase option has been exercised, the loan should be recognized, with an offsetting liability, to account for these loans that no longer meet the true-sale criteria. The Company has continued to grow the portfolio of GNMA loans sold and serviced, which has led to an increasing number and amount of delinquent loans. As such, the Company has recorded an adjustment to record the balance of the GNMA loans sold and serviced that are over 90 days past due, but not repurchased, as loans, with a corresponding other liability. Management evaluated the materiality of the error from qualitative and quantitative perspectives and concluded that the error was immaterial to the prior period financial statements taken as a whole. To provide consistency in the amounts reported in the comparable periods, the Company has recognized the delinquent GNMA loans for which the Company has the unconditional repurchase option, as well as the corresponding other liability, for the periods reported. As of December 31, 2015, this change resulted in an increase in loans and leases, net loans and leases, total assets, other liabilities, and total liabilities of $19.2 million. This change did not affect net income or shareholders' equity for any period.

Application of new accounting guidance

As of April 1, 2016, Umpqua adopted the Financial Accounting Standards Board's (FASB) Accounting Standard Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09, seeks to simplify several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. As required by ASU 2016-09, all adjustments are reflected as of the beginning of the fiscal year, January 1, 2016. By applying this ASU, the Company no longer adjusts common stock for the tax impact of shares released, instead the tax impact is recognized as tax expense in the period the shares are released. This simplifies the tracking of the excess tax benefits and deficiencies, but could cause volatility in tax expense for the periods presented. The statement of cash flows has been adjusted to reflect the provisions of this ASU. The application of this ASU did not have a material impact on the financial statements.