New Accounting Standards	3 Months Ended
Mar. 31, 2017
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	New Accounting Standards Adoption of New Accounting Standards On January 1, 2017, the Company adopted, on a prospective basis, ASU 2016-09, “Stock Compensation – Improvements to Employee Share-Based Payment Accounting (Topic 718)”, which requires entities to recognize the income tax effects for the difference between generally accepted accounting principles (GAAP) and federal income tax treatment (i.e., excess tax benefit or deficiency) of share-based awards in the income statement when the awards vest or are settled, rather than recording such effects in additional paid-in capital. As a result, the Company’s tax expense was reduced by approximately $31 million in the first quarter of 2017. Future effects will depend on the Company’s share price, restricted stock vesting, and the volume of equity incentive options exercised. For the purpose of recognizing compensation cost associated with share-based awards, ASU 2016-09 also provides entities with an accounting policy election to account for forfeitures of awards as they occur or continue with current practice of estimating forfeitures at the grant date to determine the number of awards expected to vest and adjusting that estimate as necessary. The Company has elected to continue to follow the current practice. New Accounting Standards Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” which provides new guidance on revenue recognition. The guidance clarifies that revenue from contracts with customers should be recognized in a manner that depicts the timing of the related transfer of goods or performance of services at an amount that reflects the expected consideration. The FASB has subsequently issued several amendments to the standard, including deferral of the effective date until January 1, 2018, clarification of principal versus agent considerations, narrow scope improvements and other technical corrections. Entities may elect either full or modified retrospective transition. Full retrospective transition will require a cumulative effect adjustment to retained earnings as of the earliest comparative period presented. Modified retrospective transition will require a cumulative effect adjustment to retained earnings as of the beginning of the reporting period in which the entity first applies the new guidance. The Company plans to adopt the revenue recognition guidance in the first quarter of 2018. The guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP. Accordingly, the Company does not expect an impact to net interest revenue. While the Company has not yet identified any changes in the timing of revenue recognition, the Company’s review is ongoing. The Company is evaluating the impact the new standard will have on the presentation of certain revenue streams (gross versus net reporting) and the capitalization of contract costs. The Company has not yet selected a transition method and continues to evaluate the impact the new guidance will have on its financial statements and earnings per common share (EPS). In January 2016, the FASB issued ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10),” which will become effective January 1, 2018. This new guidance addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The main provisions of the guidance include (i) most equity investments are to be measured at fair value with changes in fair value recognized in net income, except for those accounted for under the equity method or those that do not have readily determinable fair values for which a practical expedient can be elected, (ii) requires the use of an exit price notion when measuring the fair value of financial instruments for disclosure purposes, and (iii) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial instrument on the balance sheet or in the accompanying notes. The Company does not expect the adoption of ASU 2016-01 will have a material impact on its financial statements and EPS. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” which amends the accounting for leases by lessees and lessors. The primary change as a result of the new standard is the recognition of right-of-use assets and lease liabilities by lessees for those leases classified as operating leases. Additional changes include accounting for lease origination and executory costs, required lessee reassessments during the lease term due to changes in circumstances and expanded lease disclosures. ASU 2016-02 will become effective January 1, 2019, with early adoption permitted, and requires entities to apply the new guidance using a modified retrospective transition. Modified retrospective transition requires entities to apply the new guidance as of the beginning of the earliest comparative period presented in the financial statements in which the entity first applies the new standard. Certain transition reliefs are permitted if elected by the entity. The adoption of ASU 2016-02 will result in the Company recognizing a right-of-use asset and lease liability on the consolidated balance sheet based on the present value of remaining operating lease payments (see Note 14 of the Company’s 2016 Form 10-K for the undiscounted future annual minimum rental commitments for operating leases). The Company does not expect the adoption of ASU 2016-02 will have a material impact on its EPS. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” which provides new guidance for recognizing impairment of most debt instruments measured at amortized cost, including loans and HTM debt securities. The new guidance will require estimating expected credit losses (CECL) over the remaining life of an instrument or a portfolio of instruments with similar risk characteristics based on relevant information about past events, current conditions, and reasonable forecasts. The initial estimate of and the subsequent changes in CECL will be recognized as credit loss expense through current earnings and will be reflected as an allowance for credit losses offsetting the carrying value of the financial instrument(s) on the balance sheet. The new guidance also amends the OTTI model for AFS debt securities by requiring the use of an allowance, rather than directly reducing the carrying value of the security, and eliminating consideration of the length of time such security has been in an unrealized loss position as a factor in concluding whether a credit loss exists. ASU 2016-13 will become effective January 1, 2020, with early adoption permitted as of January 1, 2019. The new guidance will be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the entity applies the new guidance except that a prospective transition is required for AFS debt securities for which an OTTI had been recognized before the effective date. The Company is currently evaluating the impact of this new guidance on its financial statements and EPS. In March 2017, the FASB issued ASU 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” which shortens the amortization period for the premium on certain callable debt securities to the earliest call date. The amendments are applicable to any purchased individual debt security with an explicit and noncontingent call feature that is callable at a fixed price on a preset date. The amendments do not impact the accounting for callable debt securities held at a discount, which will continue to be accreted to maturity. ASU 2017-08 will become effective on January 1, 2019, with early adoption permitted including adoption in an interim period. The amendments will be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The Company is currently evaluating the impact of adopting ASU 2017-08 on its financial statements and EPS.

New Accounting Standards

Adoption of New Accounting Standards

On January 1, 2017, the Company adopted, on a prospective basis, ASU 2016-09, “Stock Compensation – Improvements to Employee Share-Based Payment Accounting (Topic 718)”, which requires entities to recognize the income tax effects for the difference between generally accepted accounting principles (GAAP) and federal income tax treatment (i.e., excess tax benefit or deficiency) of share-based awards in the income statement when the awards vest or are settled, rather than recording such effects in additional paid-in capital. As a result, the Company’s tax expense was reduced by approximately $31 million in the first quarter of 2017. Future effects will depend on the Company’s share price, restricted stock vesting, and the volume of equity incentive options exercised. For the purpose of recognizing compensation cost associated with share-based awards, ASU 2016-09 also provides entities with an accounting policy election to account for forfeitures of awards as they occur or continue with current practice of estimating forfeitures at the grant date to determine the number of awards expected to vest and adjusting that estimate as necessary. The Company has elected to continue to follow the current practice.

New Accounting Standards Not Yet Adopted

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” which provides new guidance on revenue recognition. The guidance clarifies that revenue from contracts with customers should be recognized in a manner that depicts the timing of the related transfer of goods or performance of services at an amount that reflects the expected consideration. The FASB has subsequently issued several amendments to the standard, including deferral of the effective date until January 1, 2018, clarification of principal versus agent considerations, narrow scope improvements and other technical corrections. Entities may elect either full or modified retrospective transition. Full retrospective transition will require a cumulative effect adjustment to retained earnings as of the earliest comparative period presented. Modified retrospective transition will require a cumulative effect adjustment to retained earnings as of the beginning of the reporting period in which the entity first applies the new guidance.

The Company plans to adopt the revenue recognition guidance in the first quarter of 2018. The guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP. Accordingly, the Company does not expect an impact to net interest revenue. While the Company has not yet identified any changes in the timing of revenue recognition, the Company’s review is ongoing. The Company is evaluating the impact the new standard will have on the presentation of certain revenue streams (gross versus net reporting) and the capitalization of contract costs. The Company has not yet selected a transition method and continues to evaluate the impact the new guidance will have on its financial statements and earnings per common share (EPS).

In January 2016, the FASB issued ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10),” which will become effective January 1, 2018. This new guidance addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The main provisions of the guidance include (i) most equity investments are to be measured at fair value with changes in fair value recognized in net income, except for those accounted for under the equity method or those that do not have readily determinable fair values for which a practical expedient can be elected, (ii) requires the use of an exit price notion when measuring the fair value of financial instruments for disclosure purposes, and (iii) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial instrument on the balance sheet or in the accompanying notes. The Company does not expect the adoption of ASU 2016-01 will have a material impact on its financial statements and EPS.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” which amends the accounting for leases by lessees and lessors. The primary change as a result of the new standard is the recognition of right-of-use assets and lease liabilities by lessees for those leases classified as operating leases. Additional changes include accounting for lease origination and executory costs, required lessee reassessments during the lease term due to changes in circumstances and expanded lease disclosures. ASU 2016-02 will become effective January 1, 2019, with early adoption permitted, and requires entities to apply the new guidance using a modified retrospective transition. Modified retrospective transition requires entities to apply the new guidance as of the beginning of the earliest comparative period presented in the financial statements in which the entity first applies the new standard. Certain transition reliefs are permitted if elected by the entity. The adoption of ASU 2016-02 will result in the Company recognizing a right-of-use asset and lease liability on the consolidated balance sheet based on the present value of remaining operating lease payments (see Note 14 of the Company’s 2016 Form 10-K for the undiscounted future annual minimum rental commitments for operating leases). The Company does not expect the adoption of ASU 2016-02 will have a material impact on its EPS.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” which provides new guidance for recognizing impairment of most debt instruments measured at amortized cost, including loans and HTM debt securities. The new guidance will require estimating expected credit losses (CECL) over the remaining life of an instrument or a portfolio of instruments with similar risk characteristics based on relevant information about past events, current conditions, and reasonable forecasts. The initial estimate of and the subsequent changes in CECL will be recognized as credit loss expense through current earnings and will be reflected as an allowance for credit losses offsetting the carrying value of the financial instrument(s) on the balance sheet. The new guidance also amends the OTTI model for AFS debt securities by requiring the use of an allowance, rather than directly reducing the carrying value of the security, and eliminating consideration of the length of time such security has been in an unrealized loss position as a factor in concluding whether a credit loss exists. ASU 2016-13 will become effective January 1, 2020, with early adoption permitted as of January 1, 2019. The new guidance will be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the entity applies the new guidance except that a prospective transition is required for AFS debt securities for which an OTTI had been recognized before the effective date. The Company is currently evaluating the impact of this new guidance on its financial statements and EPS.

In March 2017, the FASB issued ASU 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” which shortens the amortization period for the premium on certain callable debt securities to the earliest call date. The amendments are applicable to any purchased individual debt security with an explicit and noncontingent call feature that is callable at a fixed price on a preset date. The amendments do not impact the accounting for callable debt securities held at a discount, which will continue to be accreted to maturity. ASU 2017-08 will become effective on January 1, 2019, with early adoption permitted including adoption in an interim period. The amendments will be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The Company is currently evaluating the impact of adopting ASU 2017-08 on its financial statements and EPS.