Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]
Offsetting Derivative Positions	Offsetting Derivative Positions In accordance with the applicable accounting guidance, we take into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related cash collateral when recognizing derivative assets and liabilities. Additional information regarding derivative offsetting is provided in Note 7 (“Derivatives and Hedging Activities”).
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses In the third quarter of 2015, we enhanced the approach used to determine the commercial reserve factors used in estimating the commercial ALLL, which had the effect of capturing certain elements in the commercial quantitative reserve component that had formerly been included in the commercial qualitative component. Under the enhanced methodology, we began utilizing more refined commercial estimated loss rates that represent cumulative losses over the estimated average time period from the onset of credit deterioration to the initial loss recorded for an individual loan. In addition, we began utilizing an enhanced framework to quantify commercial ALLL adjustments resulting from qualitative factors that may not be fully captured within the statistical analysis of incurred loss. The impact of these changes was largely neutral to the total ALLL at September 30, 2015. However, because the quantitative reserve is allocated to the business segments at a loan level, while the qualitative portion is allocated at the portfolio level, the impact of the methodology enhancements on the allowance for each business segment and each portfolio caused the business segment and commercial portfolio reserves to increase or decrease accordingly. The impact of the increases and decreases on the business segment and commercial portfolio reserves was not significant.
Troubled Debt Restructurings	*Troubled debt restructurings.* In August 2014, the FASB issued new accounting guidance that clarifies how to account for certain government-guaranteed mortgage loans upon foreclosure. This accounting guidance was effective for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us) and could be implemented using either a modified retrospective method or a prospective method. Early adoption was permitted. We elected to implement the new accounting guidance using a prospective approach. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. In January 2014, the FASB issued new accounting guidance that clarifies the definition of when an in substance repossession or foreclosure occurs for purposes of creditor reclassification of residential real estate collateralized consumer mortgage loans by derecognizing the loan and recognizing the collateral asset. This accounting guidance was effective for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us) and could be implemented using either a modified retrospective method or prospective method. Early adoption was permitted. We elected to implement the new accounting guidance using a prospective approach. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. We provide the disclosure related to consumer residential mortgages required by this new accounting guidance in Note 4 (“Asset Quality”).
Transfers and Servicing of Financial Assets	*Transfers and servicing of financial assets.* In June 2014, the FASB issued new accounting guidance that applies secured borrowing accounting to repurchase-to-maturity transactions and linked repurchase financings and expands disclosure requirements. This accounting guidance was effective for interim and annual reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us) and was implemented using a cumulative-effect approach to transactions outstanding as of the effective date with no adjustment to prior periods. The disclosure for secured borrowings will be presented for annual periods beginning after December 15, 2014, and has been presented for interim periods beginning after March 15, 2015 (June 30, 2015, for us). Early adoption was not permitted. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.
Discontinued Operations	*Discontinued operations.* In April 2014, the FASB issued new accounting guidance that revises the criteria for determining when disposals should be reported as discontinued operations and modifies the disclosure requirements. This accounting guidance was effective prospectively for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us). Early adoption was permitted. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.
Investments in Qualified Affordable Housing Projects	*Investments in qualified affordable housing projects.* In January 2014, the FASB issued new accounting guidance that modifies the conditions that must be met to make an election to account for investments in qualified affordable housing projects using the proportional amortization method or the practical expedient method to the proportional amortization method. This accounting guidance was effective retrospectively for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us). Early adoption was permitted. We elected to amortize our LIHTCs under the practical expedient method to the proportional amortization method. As our LIHTCs were previously accounted for under the effective yield method and related amortization expense was previously classified as income taxes in our Consolidated Statements of Income, the adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. We provide additional information regarding our LIHTCs in Note 9.
Business combinations	*Business combinations.* In September 2015, the FASB issued new accounting guidance that obligates an acquirer in a business combination to recognize adjustments to provisional amounts in the reporting period that the amounts were determined, eliminating the requirement for retrospective adjustments. The acquirer should record in the current period any income effects that resulted from the change in provisional amounts, calculated as if the accounting were completed at the acquisition date. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using the prospective method. Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Fair Value Measurement	*Fair value measurement.* In May 2015, the FASB issued new disclosure guidance that eliminates the requirement to categorize investments measured using the net asset value practical expedient in the fair value hierarchy table. Entities will be required to disclose the fair value of investments measured using the net asset value practical expedient so that financial statement users can reconcile amounts reported in the fair value hierarchy table to amounts reported on the balance sheet. This disclosure will be presented for interim and annual reporting periods beginning after December 15, 2015 (March 31, 2016, for us) on a retrospective basis. Early adoption is permitted. The adoption of this disclosure guidance will not affect our financial condition or results of operations.
Cloud Computing Fees	*Cloud computing fees.* In April 2015, the FASB issued new accounting guidance that clarifies a customer’s accounting for fees paid in a cloud computing arrangement. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and can be implemented using either a prospective method or a retrospective method. Early adoption is permitted. We have elected to implement this new accounting guidance using a prospective approach. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Imputation of Interest	*Imputation of interest.* In April 2015, the FASB issued new accounting guidance that requires 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. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using a retrospective method. Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Consolidation	*Consolidation.* In February 2015, the FASB issued new accounting guidance that changes the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The new guidance amends the current accounting guidance to address limited partnerships and similar legal entities, certain investment funds, fees paid to a decision maker or service provider, and the impact of fee arrangements and related parties on the primary beneficiary determination. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using a modified retrospective basis. Retrospective application to all relevant prior periods and early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations. In August 2014, the FASB issued new accounting guidance that clarifies how to measure the financial assets and the financial liabilities of a consolidated collateralized financing entity. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and can be implemented using either a retrospective method or a cumulative-effect approach. Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Derivatives and Hedging	*Derivatives and hedging.* In November 2014, the FASB issued new accounting guidance that clarifies how current guidance should be interpreted when evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. An entity should consider all relevant terms and features, including the embedded derivative feature being evaluated for bifurcation, when evaluating the nature of a host contract. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using a modified retrospective basis. Retrospective application to all relevant prior periods and early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Going Concern	*Going concern.* In August 2014, the FASB issued new accounting guidance that requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date the financial statements are issued. Disclosure is required when conditions or events raise substantial doubt about an entity’s ability to continue as a going concern. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2016 (effective January 1, 2017, for us). Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Stock-based Compensation	*Stock-based compensation.* In June 2014, the FASB issued new accounting guidance that clarifies how to account for share-based payments when the terms of an award provide that a performance target could be achieved after the requisite service period. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and can be implemented using either a retrospective method or a prospective method. Early adoption is permitted. We have elected to implement this new accounting guidance using a prospective approach. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Revenue Recognition	*Revenue recognition.* In May 2014, the FASB issued new accounting guidance that revises the criteria for determining when to recognize revenue from contracts with customers and expands disclosure requirements. This accounting guidance can be implemented using either a retrospective method or a cumulative-effect approach. In August 2015, the FASB issued an update that defers the effective date of the revenue recognition guidance by one year. This new guidance will be effective for interim and annual reporting periods beginning after December 15, 2017 (effective January 1, 2018, for us). Early adoption is permitted but only for interim and annual reporting periods beginning after December 15, 2016. We have elected to implement this new accounting guidance using a cumulative-effect approach. Our preliminary analysis suggests that the adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations. There are many aspects of this new accounting guidance that are still being interpreted, and the FASB has recently issued and proposed updates to certain aspects of the guidance. Therefore, the results of our materiality analysis may change based on the conclusions reached as to the application of the new guidance.

Basis of Presentation and Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2015

Offsetting Derivative Positions

In accordance with the applicable accounting guidance, we take into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related cash collateral when recognizing derivative assets and liabilities. Additional information regarding derivative offsetting is provided in Note 7 (“Derivatives and Hedging Activities”).

Allowance for Loan and Lease Losses

Allowance for Loan and Lease Losses

In the third quarter of 2015, we enhanced the approach used to determine the commercial reserve factors used in estimating the commercial ALLL, which had the effect of capturing certain elements in the commercial quantitative reserve component that had formerly been included in the commercial qualitative component. Under the enhanced methodology, we began utilizing more refined commercial estimated loss rates that represent cumulative losses over the estimated average time period from the onset of credit deterioration to the initial loss recorded for an individual loan. In addition, we began utilizing an enhanced framework to quantify commercial ALLL adjustments resulting from qualitative factors that may not be fully captured within the statistical analysis of incurred loss. The impact of these changes was largely neutral to the total ALLL at September 30, 2015. However, because the quantitative reserve is allocated to the business segments at a loan level, while the qualitative portion is allocated at the portfolio level, the impact of the methodology enhancements on the allowance for each business segment and each portfolio caused the business segment and commercial portfolio reserves to increase or decrease accordingly. The impact of the increases and decreases on the business segment and commercial portfolio reserves was not significant.

Troubled Debt Restructurings

Troubled debt restructurings. In August 2014, the FASB issued new accounting guidance that clarifies how to account for certain government-guaranteed mortgage loans upon foreclosure. This accounting guidance was effective for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us) and could be implemented using either a modified retrospective method or a prospective method. Early adoption was permitted. We elected to implement the new accounting guidance using a prospective approach. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.

In January 2014, the FASB issued new accounting guidance that clarifies the definition of when an in substance repossession or foreclosure occurs for purposes of creditor reclassification of residential real estate collateralized consumer mortgage loans by derecognizing the loan and recognizing the collateral asset. This accounting guidance was effective for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us) and could be implemented using either a modified retrospective method or prospective method. Early adoption was permitted. We elected to implement the new accounting guidance using a prospective approach. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. We provide the disclosure related to consumer residential mortgages required by this new accounting guidance in Note 4 (“Asset Quality”).

Transfers and Servicing of Financial Assets

Transfers and servicing of financial assets. In June 2014, the FASB issued new accounting guidance that applies secured borrowing accounting to repurchase-to-maturity transactions and linked repurchase financings and expands disclosure requirements. This accounting guidance was effective for interim and annual reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us) and was implemented using a cumulative-effect approach to transactions outstanding as of the effective date with no adjustment to prior periods. The disclosure for secured borrowings will be presented for annual periods beginning after December 15, 2014, and has been presented for interim periods beginning after March 15, 2015 (June 30, 2015, for us). Early adoption was not permitted. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.

Discontinued Operations

Discontinued operations. In April 2014, the FASB issued new accounting guidance that revises the criteria for determining when disposals should be reported as discontinued operations and modifies the disclosure requirements. This accounting guidance was effective prospectively for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us). Early adoption was permitted. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.

Investments in Qualified Affordable Housing Projects

Investments in qualified affordable housing projects. In January 2014, the FASB issued new accounting guidance that modifies the conditions that must be met to make an election to account for investments in qualified affordable housing projects using the proportional amortization method or the practical expedient method to the proportional amortization method. This accounting guidance was effective retrospectively for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us). Early adoption was permitted. We elected to amortize our LIHTCs under the practical expedient method to the proportional amortization method. As our LIHTCs were previously accounted for under the effective yield method and related amortization expense was previously classified as income taxes in our Consolidated Statements of Income, the adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. We provide additional information regarding our LIHTCs in Note 9.

Business combinations

Business combinations. In September 2015, the FASB issued new accounting guidance that obligates an acquirer in a business combination to recognize adjustments to provisional amounts in the reporting period that the amounts were determined, eliminating the requirement for retrospective adjustments. The acquirer should record in the current period any income effects that resulted from the change in provisional amounts, calculated as if the accounting were completed at the acquisition date. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using the prospective method. Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Fair Value Measurement

Fair value measurement. In May 2015, the FASB issued new disclosure guidance that eliminates the requirement to categorize investments measured using the net asset value practical expedient in the fair value hierarchy table. Entities will be required to disclose the fair value of investments measured using the net asset value practical expedient so that financial statement users can reconcile amounts reported in the fair value hierarchy table to amounts reported on the balance sheet. This disclosure will be presented for interim and annual reporting periods beginning after December 15, 2015 (March 31, 2016, for us) on a retrospective basis. Early adoption is permitted. The adoption of this disclosure guidance will not affect our financial condition or results of operations.

Cloud Computing Fees

Cloud computing fees. In April 2015, the FASB issued new accounting guidance that clarifies a customer’s accounting for fees paid in a cloud computing arrangement. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and can be implemented using either a prospective method or a retrospective method. Early adoption is permitted. We have elected to implement this new accounting guidance using a prospective approach. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Imputation of Interest

Imputation of interest. In April 2015, the FASB issued new accounting guidance that requires 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. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using a retrospective method. Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Consolidation

Consolidation. In February 2015, the FASB issued new accounting guidance that changes the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The new guidance amends the current accounting guidance to address limited partnerships and similar legal entities, certain investment funds, fees paid to a decision maker or service provider, and the impact of fee arrangements and related parties on the primary beneficiary determination. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using a modified retrospective basis. Retrospective application to all relevant prior periods and early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

In August 2014, the FASB issued new accounting guidance that clarifies how to measure the financial assets and the financial liabilities of a consolidated collateralized financing entity. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and can be implemented using either a retrospective method or a cumulative-effect approach. Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Derivatives and Hedging

Derivatives and hedging. In November 2014, the FASB issued new accounting guidance that clarifies how current guidance should be interpreted when evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. An entity should consider all relevant terms and features, including the embedded derivative feature being evaluated for bifurcation, when evaluating the nature of a host contract. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and should be implemented using a modified retrospective basis. Retrospective application to all relevant prior periods and early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Going Concern

Going concern. In August 2014, the FASB issued new accounting guidance that requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date the financial statements are issued. Disclosure is required when conditions or events raise substantial doubt about an entity’s ability to continue as a going concern. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2016 (effective January 1, 2017, for us). Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Stock-based Compensation

Stock-based compensation. In June 2014, the FASB issued new accounting guidance that clarifies how to account for share-based payments when the terms of an award provide that a performance target could be achieved after the requisite service period. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2015 (effective January 1, 2016, for us) and can be implemented using either a retrospective method or a prospective method. Early adoption is permitted. We have elected to implement this new accounting guidance using a prospective approach. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Revenue Recognition

Revenue recognition. In May 2014, the FASB issued new accounting guidance that revises the criteria for determining when to recognize revenue from contracts with customers and expands disclosure requirements. This accounting guidance can be implemented using either a retrospective method or a cumulative-effect approach. In August 2015, the FASB issued an update that defers the effective date of the revenue recognition guidance by one year. This new guidance will be effective for interim and annual reporting periods beginning after December 15, 2017 (effective January 1, 2018, for us). Early adoption is permitted but only for interim and annual reporting periods beginning after December 15, 2016. We have elected to implement this new accounting guidance using a cumulative-effect approach. Our preliminary analysis suggests that the adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations. There are many aspects of this new accounting guidance that are still being interpreted, and the FASB has recently issued and proposed updates to certain aspects of the guidance. Therefore, the results of our materiality analysis may change based on the conclusions reached as to the application of the new guidance.