Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations Webster Financial Corporation (collectively, with its consolidated subsidiaries, “Webster” or the “Company”) is a bank holding company and financial holding company under the Bank Holding Company Act of 1956, as amended, incorporated under the laws of Delaware in 1986 and headquartered in Waterbury, Connecticut. At June 30, 2015, Webster Financial Corporation's principal asset is all of the outstanding capital stock of Webster Bank, National Association ("Webster Bank"). Webster, through Webster Bank and various non-banking financial services subsidiaries, delivers financial services to individuals, families, and businesses primarily from New York to Massachusetts. Webster provides business and consumer banking, mortgage lending, financial planning, trust, and investment services through banking offices, ATMs, telephone banking, mobile banking, and its internet website (www.websterbank.com). Webster also offers equipment financing, commercial real estate lending, and asset-based lending primarily across the Northeast. On a nationwide basis, through its HSA Bank division, Webster Bank offers and administers health savings accounts, flexible spending accounts, health reimbursement accounts, and commuter benefits. Basis of Presentation The accounting and reporting policies of the Company that materially affect the Condensed Consolidated Financial Statements conform with U.S. Generally Accepted Accounting Principles ("GAAP"). The accompanying unaudited Condensed Consolidated Financial Statements of the Company have been prepared in conformity with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all the information and notes required by GAAP for complete financial statements and should be read in conjunction with the Company's Consolidated Financial Statements, and notes thereto, for the year ended December 31, 2014, included in the Company's Annual Report on Form 10-K filed with the SEC on February 27, 2015. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as income and expense during the period. Actual results could differ from those estimates. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full year or any future period. Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on net income, comprehensive income, total assets, total liabilities, total shareholders' equity, net cash provided by operating activities, net cash used for investing activities, and net cash provided by financing activities. Acquisition On January 13, 2015 (the "acquisition date”), Webster Bank completed its acquisition of the health savings account business of JPMorgan Chase Bank, N.A. The results of the acquisition have been included in the financial statements from the acquisition date. See Note 2: Acquisition and Note 6: Goodwill and Other Intangible Assets for further information. Modifications to Significant Accounting Policies Non-accrual loans. Effective during the first quarter of 2015, residential loans that are more than 90 days past due, fully insured against loss, and in the process of collection, remain accruing loans and are reported as 90 days or more past due and accruing. Previously, these loans were placed on non-accrual when payments were 90 days or more past due. For presentation purposes, previously reported amounts have been reclassified to conform to the current year presentation. The change in accounting policy did not have a material impact on the financial statements. Other intangible assets. Other intangible assets with finite useful lives are amortized to non-interest expense over their estimated useful lives. Effective during the first quarter of 2015, core deposit intangibles resulting from the health savings account acquisition are amortized on an accelerated basis over their estimated useful lives. Core deposit intangibles existing prior to the health savings account acquisition will continue to be amortized on a straight line basis over their remaining estimated useful lives. Intangible assets relating to customer relationships are amortized on a straight line basis over their estimated useful lives. Recently Adopted Accounting Standards Updates ASU No. 2014-01 - Investments - Equity Method and Joint Ventures (Topic 323) - "Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force)." The Update requires an entity to disclose information about its investments in qualified affordable housing projects and provides an accounting policy election for it to account for such investments using the proportional amortization method. Under that method, the initial cost of an investment is amortized in proportion to its tax credits and other tax benefits as a component of income tax expense or benefit. The decision to apply the proportionate amortization method is to be applied consistently to all such investments. The Company adopted this Update effective January 1, 2015 and retrospectively applied the effects of its accounting policy decision to use the proportional amortization method, as Webster believes presenting the investment performance net of taxes as a component of income tax expense or benefit better represents the economics of such investments. The change had no material effect on the Company's financial statements. ASU No. 2014-04, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40) - "Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force)." The Update clarifies that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar agreement. In addition, the Update requires disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure in accordance with local requirements of the applicable jurisdiction. The Update was adopted during the first quarter of 2015, by prospective transition, and did not have a material impact on the Company's financial statements. ASU No. 2014-11 - Transfers and Servicing (Topic 860) - “Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures.” The Update requires two accounting changes: (i) repurchase-to-maturity transactions are to be accounted for as secured borrowings; and (ii) with respect to repurchase financing arrangements, accounting is required for a transfer of a financial asset contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. Additionally, disclosure requirements have been expanded to include a disaggregation of collateral used for secured borrowings, and contractual maturity disclosure has been expanded to interim periods. The Update was adopted during the first quarter of 2015 and did not have a material impact on the Company's financial statements. ASU No. 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40) - "Classification of Certain Government-Guaranteed Residential Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force)." The Update has been issued to reduce diversity in practice in the classification of foreclosed residential mortgage loans held by creditors that are fully guaranteed under certain government programs, including the Federal Housing Administration guarantees. A residential mortgage loan would be derecognized, and a separate other receivable would be recognized upon foreclosure if the loan has both of the following characteristics: (i) the loan has a government guarantee that is not separable from the loan before foreclosure entitling the creditor to the full unpaid principal balance of the loan; and (ii) at the time of foreclosure, the creditor has the intent to make a claim on the guarantee and the ability to recover the full unpaid principal balance of the loan through the guarantee. Notably, upon foreclosure, the separate other receivable would be measured based on the current amount of the loan balance expected to be recovered under the guarantee. The Update was adopted during the first quarter of 2015 and did not have a material impact on the Company's financial statements. Recently Issued Accounting Standards Updates ASU No. 2014-09 - Revenue from Contracts with Customers (Topic 606). The Update establishes a single comprehensive model for an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled, and will supersede nearly all existing revenue recognition guidance, and clarify and converge revenue recognition principles under US GAAP and IFRS. The update outlines five steps to recognizing revenue: (i) identify the contracts with the customer; (ii) identify the separate performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the separate performance obligations; and (v) recognize revenue when each performance obligation is satisfied. The update requires more comprehensive disclosures, relating to quantitative and qualitative information for amounts, timing, the nature and uncertainty of revenue, and cash flows arising from contracts with customers, which will mainly impact construction and high-tech industries. The most significant potential impact to banking entities relates to less prescriptive derecognition requirements on the sale of owned real estate properties. An entity may elect either a full retrospective or a modified retrospective application. Subsequent to the filing of the Company's Consolidated Financial Statements and Notes thereto for the year ended December 31, 2014, included in its 2014 Form 10-K, the effective date for this Update was changed from annual and interim periods beginning after December 15, 2016 to annual and interim periods beginning after December 15, 2017. As such, the Company has revised its intended adoption of the Update to the first quarter of 2018. Adoption is not anticipated to have a material impact on the Company's financial statements. ASU No. 2015-02 - Consolidation (Topic 810) - "Amendments to the Consolidation Analysis." The Update affects limited partnerships and similar legal entities, the evaluation of fees paid to a decision maker or a service provider as a variable interest, the effect of fee arrangements and related parties on the primary beneficiary determination, and certain investment funds. The Company intends to adopt the Update during the first quarter of 2016. Adoption is not anticipated to have a material impact on the Company's financial statements. ASU No. 2015-03 - Interest - Imputation of Interest (Subtopic 835-30) - "Simplifying the Presentation of Debt Issuance Costs." The Update simplifies the presentation of debt issuance costs, by requiring that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update. An entity should apply the Update on a retrospective basis. The Company intends to adopt the Update during the first quarter of 2016. Adoption is not anticipated to have a material impact on the Company's financial statements. ASU No. 2015-07 - Fair Value Measurement (Topic 820) - "Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent) (a consensus of the FASB Emerging Issues Task Force)." The Update removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. The Update also removes the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value per share practical expedient. Rather, those disclosures are limited to investments for which the entity has elected to measure the fair value using that practical expedient An entity should apply the Update on a retrospective basis. The Company intends to adopt the Update during the first quarter of 2016. Adoption is not anticipated to have a material impact on the Company's financial statements.

Summary of Significant Accounting Policies

Nature of Operations

Webster Financial Corporation (collectively, with its consolidated subsidiaries, “Webster” or the “Company”) is a bank holding company and financial holding company under the Bank Holding Company Act of 1956, as amended, incorporated under the laws of Delaware in 1986 and headquartered in Waterbury, Connecticut. At June 30, 2015, Webster Financial Corporation's principal asset is all of the outstanding capital stock of Webster Bank, National Association ("Webster Bank").

Webster, through Webster Bank and various non-banking financial services subsidiaries, delivers financial services to individuals, families, and businesses primarily from New York to Massachusetts. Webster provides business and consumer banking, mortgage lending, financial planning, trust, and investment services through banking offices, ATMs, telephone banking, mobile banking, and its internet website (www.websterbank.com). Webster also offers equipment financing, commercial real estate lending, and asset-based lending primarily across the Northeast. On a nationwide basis, through its HSA Bank division, Webster Bank offers and administers health savings accounts, flexible spending accounts, health reimbursement accounts, and commuter benefits.

Basis of Presentation

The accounting and reporting policies of the Company that materially affect the Condensed Consolidated Financial Statements conform with U.S. Generally Accepted Accounting Principles ("GAAP"). The accompanying unaudited Condensed Consolidated Financial Statements of the Company have been prepared in conformity with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all the information and notes required by GAAP for complete financial statements and should be read in conjunction with the Company's Consolidated Financial Statements, and notes thereto, for the year ended December 31, 2014, included in the Company's Annual Report on Form 10-K filed with the SEC on February 27, 2015.

The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities as of the date of the financial statements as well as income and expense during the period. Actual results could differ from those estimates. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full year or any future period.

Certain prior period amounts have been reclassified to conform to the current year's presentation. These reclassifications had an immaterial effect on net income, comprehensive income, total assets, total liabilities, total shareholders' equity, net cash provided by operating activities, net cash used for investing activities, and net cash provided by financing activities.

Acquisition

On January 13, 2015 (the "acquisition date”), Webster Bank completed its acquisition of the health savings account business of JPMorgan Chase Bank, N.A. The results of the acquisition have been included in the financial statements from the acquisition date. See Note 2: Acquisition and Note 6: Goodwill and Other Intangible Assets for further information.

Modifications to Significant Accounting Policies

Non-accrual loans. Effective during the first quarter of 2015, residential loans that are more than 90 days past due, fully insured against loss, and in the process of collection, remain accruing loans and are reported as 90 days or more past due and accruing. Previously, these loans were placed on non-accrual when payments were 90 days or more past due. For presentation purposes, previously reported amounts have been reclassified to conform to the current year presentation. The change in accounting policy did not have a material impact on the financial statements.

Other intangible assets. Other intangible assets with finite useful lives are amortized to non-interest expense over their estimated useful lives. Effective during the first quarter of 2015, core deposit intangibles resulting from the health savings account acquisition are amortized on an accelerated basis over their estimated useful lives. Core deposit intangibles existing prior to the health savings account acquisition will continue to be amortized on a straight line basis over their remaining estimated useful lives. Intangible assets relating to customer relationships are amortized on a straight line basis over their estimated useful lives.

Recently Adopted Accounting Standards Updates

ASU No. 2014-01 - Investments - Equity Method and Joint Ventures (Topic 323) - "Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force)." The Update requires an entity to disclose information about its investments in qualified affordable housing projects and provides an accounting policy election for it to account for such investments using the proportional amortization method. Under that method, the initial cost of an investment is amortized in proportion to its tax credits and other tax benefits as a component of income tax expense or benefit. The decision to apply the proportionate amortization method is to be applied consistently to all such investments. The Company adopted this Update effective January 1, 2015 and retrospectively applied the effects of its accounting policy decision to use the proportional amortization method, as Webster believes presenting the investment performance net of taxes as a component of income tax expense or benefit better represents the economics of such investments. The change had no material effect on the Company's financial statements.

ASU No. 2014-04, Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40) - "Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force)." The Update clarifies that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (i) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (ii) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar agreement. In addition, the Update requires disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure in accordance with local requirements of the applicable jurisdiction. The Update was adopted during the first quarter of 2015, by prospective transition, and did not have a material impact on the Company's financial statements.

ASU No. 2014-11 - Transfers and Servicing (Topic 860) - “Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures.” The Update requires two accounting changes: (i) repurchase-to-maturity transactions are to be accounted for as secured borrowings; and (ii) with respect to repurchase financing arrangements, accounting is required for a transfer of a financial asset contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. Additionally, disclosure requirements have been expanded to include a disaggregation of collateral used for secured borrowings, and contractual maturity disclosure has been expanded to interim periods. The Update was adopted during the first quarter of 2015 and did not have a material impact on the Company's financial statements.

ASU No. 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40) - "Classification of Certain Government-Guaranteed Residential Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force)." The Update has been issued to reduce diversity in practice in the classification of foreclosed residential mortgage loans held by creditors that are fully guaranteed under certain government programs, including the Federal Housing Administration guarantees. A residential mortgage loan would be derecognized, and a separate other receivable would be recognized upon foreclosure if the loan has both of the following characteristics: (i) the loan has a government guarantee that is not separable from the loan before foreclosure entitling the creditor to the full unpaid principal balance of the loan; and (ii) at the time of foreclosure, the creditor has the intent to make a claim on the guarantee and the ability to recover the full unpaid principal balance of the loan through the guarantee. Notably, upon foreclosure, the separate other receivable would be measured based on the current amount of the loan balance expected to be recovered under the guarantee. The Update was adopted during the first quarter of 2015 and did not have a material impact on the Company's financial statements.

Recently Issued Accounting Standards Updates

ASU No. 2014-09 - Revenue from Contracts with Customers (Topic 606). The Update establishes a single comprehensive model for an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled, and will supersede nearly all existing revenue recognition guidance, and clarify and converge revenue recognition principles under US GAAP and IFRS. The update outlines five steps to recognizing revenue: (i) identify the contracts with the customer; (ii) identify the separate performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the separate performance obligations; and (v) recognize revenue when each performance obligation is satisfied. The update requires more comprehensive disclosures, relating to quantitative and qualitative information for amounts, timing, the nature and uncertainty of revenue, and cash flows arising from contracts with customers, which will mainly impact construction and high-tech industries. The most significant potential impact to banking entities relates to less prescriptive derecognition requirements on the sale of owned real estate properties. An entity may elect either a full retrospective or a modified retrospective application. Subsequent to the filing of the Company's Consolidated Financial Statements and Notes thereto for the year ended December 31, 2014, included in its 2014 Form 10-K, the effective date for this Update was changed from annual and interim periods beginning after December 15, 2016 to annual and interim periods beginning after December 15, 2017. As such, the Company has revised its intended adoption of the Update to the first quarter of 2018. Adoption is not anticipated to have a material impact on the Company's financial statements.

ASU No. 2015-02 - Consolidation (Topic 810) - "Amendments to the Consolidation Analysis." The Update affects limited partnerships and similar legal entities, the evaluation of fees paid to a decision maker or a service provider as a variable interest, the effect of fee arrangements and related parties on the primary beneficiary determination, and certain investment funds. The Company intends to adopt the Update during the first quarter of 2016. Adoption is not anticipated to have a material impact on the Company's financial statements.

ASU No. 2015-03 - Interest - Imputation of Interest (Subtopic 835-30) - "Simplifying the Presentation of Debt Issuance Costs." The Update simplifies the presentation of debt issuance costs, by requiring that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update. An entity should apply the Update on a retrospective basis. The Company intends to adopt the Update during the first quarter of 2016. Adoption is not anticipated to have a material impact on the Company's financial statements.

ASU No. 2015-07 - Fair Value Measurement (Topic 820) - "Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent) (a consensus of the FASB Emerging Issues Task Force)." The Update removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. The Update also removes the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value per share practical expedient. Rather, those disclosures are limited to investments for which the entity has elected to measure the fair value using that practical expedient An entity should apply the Update on a retrospective basis. The Company intends to adopt the Update during the first quarter of 2016. Adoption is not anticipated to have a material impact on the Company's financial statements.