Recent Accounting Pronouncements	9 Months Ended
Sep. 30, 2019
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	16. Recent Accounting Pronouncements Accounting Standards Adopted in 2019 In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. With the exception of short-term leases, lessees are required to recognize a lease liability representing the lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset representing the lessee’s right to use, or control the use of, a specified asset for the lease term upon adoption. Lessor accounting was largely unchanged under the new guidance, except for clarification of the definition of initial direct costs which provided additional guidance on the timing of recognition of those costs. Subsequent to the issuance of this update, the FASB issued three additional ASUs that provide codification improvements and certain transition elections, including ASU 2018-11, which permits an additional transition method whereby an entity may elect to record a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company was required to and did adopt the standard effective January 1, 2019, using the modified retrospective transition method permitted by ASU 2018-11. Thus, the Company’s reporting for the comparative period presented in the financial statements and disclosures continues to be in accordance with GAAP Topic 840. Upon adoption, the Company recorded a gross-up of assets and liabilities in its Consolidated Balance Sheet, with approximately $116 million for right of use assets and $131 million of lease payment obligations offset by the elimination of $15 million of existing lease incentive and other deferred rent liabilities. Accounting for leases in accordance with Topic 842 has not had a material impact upon the Company’s consolidated results of operations, and is not expected to in future periods. Refer to Note 5 – Operating Leases for further information related to operating lease accounting policy, practical expedient elections for adoption and operating leasing information at adoption and as of September 30, 2019. Issued but Not Yet Adopted Accounting Standards In April 2019, the FASB issued ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments.” The Update provides clarification and correction to certain areas of previously issued ASUs concerning financial instruments (2016-01, 2016-13 and 2017-12). The FASB does not expect the provisions contained in this Update to have a significant effect on current accounting practice. Effective dates for adoption of this Update’s provisions vary in accordance with the effective dates and adoption status of the amended ASUs. The Company is currently assessing the impact of adoption of this guidance, but it is not expected to have a material impact upon its financial position and results of operations. In August 2018, the FASB issued ASU 2018-14, “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” The amendments in this Update modify certain disclosure requirements by removing disclosures that are no longer considered cost beneficial, clarifying specific requirements of disclosures, and adding disclosure requirements identified as relevant. The amendments in this Update are effective for fiscal years ending after December 15, 2020 for public business entities, and early adoption is permitted. The Company is currently assessing the impact of adoption of this guidance upon its pension and postretirement plan disclosures. Adoption of this guidance will have no impact upon the Company’s results of operations or financial condition. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” The amendments in this Update modify certain disclosure requirements on fair value measurements set forth in Topic 820, Fair Value Measurements. In addition, the amendments in this Update eliminate the phrase “an entity shall disclose at a minimum” to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements. The amendments in this Update are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 31, 2019, and early adoption is permitted. The Company is currently assessing the impact of adoption of this guidance upon its fair value measurements disclosures. Adoption of this guidance will have no impact upon the Company’s results of operations or financial condition. In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The ASU, more commonly referred to as Current Expected Credit Losses, or CECL, requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations are required to use forward-looking information to inform their credit loss estimates. Many of the loss estimation techniques currently applied will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. In addition, the ASU amends the accounting for credit losses on debt securities and purchased financial assets with credit deterioration. The ASU is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with a cumulative-effect adjustment to retained earnings for non-purchased credit impaired loans as of the beginning of the year of adoption. For purchased credit impaired loans, there is no impact to retained earnings upon adoption; rather, the entity will reclassify a portion of the purchase accounting fair value mark to allowance for credit losses as of the beginning of the year of adoption. Early application is permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company will not early adopt this guidance. The Company has internally developed credit models and completed the implementation of a vendor provided platform to aggregate inputs and perform the calculation of allowance for credit losses. The validation of the credit loss models is ongoing and expected to be completed during the fourth quarter of 2019. Additional CECL implementation activities in the fourth quarter 2019 will include refinement of procedures, completion of the design and implementation of internal controls over financial reporting, conclusion of validation of credit models and end-to-end processes, and drafting of newly required disclosures. The Company has completed parallel testing of the CECL estimation process for the third quarter 2019, which included executed controls established to-date surrounding data, models and governance. Results from this process indicated a net increase of approximately 20 to 30 percent over the September 30, 2019 incurred loan loss reserve level utilizing the CECL models and current economic forecast; this range excludes the impact of the loans and debt securities recently acquired from MidSouth. The Company’s CECL allowance for loan losses estimates losses over a two-year reasonable and supportable forecast period utilizing the weighted average of a range of macroeconomic scenarios, and then reverts to longer historical loss experience to estimate losses for the remaining life. Significant drivers in the aforementioned increase were higher calculated reserve levels for longer life real-estate secured loans and the expected funding of off-balance sheet exposures, partially offset by lower reserves for shorter-term commercial loans. Immaterial expected credit losses were calculated on held to maturity debt securities. The amount of increase in allowance for credit losses upon adoption will be impacted by the portfolio composition and quality as well as current economic conditions and forecasts at that time.

Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2019

Accounting Changes And Error Corrections [Abstract]

16. Recent Accounting Pronouncements

Accounting Standards Adopted in 2019

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. With the exception of short-term leases, lessees are required to recognize a lease liability representing the lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset representing the lessee’s right to use, or control the use of, a specified asset for the lease term upon adoption. Lessor accounting was largely unchanged under the new guidance, except for clarification of the definition of initial direct costs which provided additional guidance on the timing of recognition of those costs. Subsequent to the issuance of this update, the FASB issued three additional ASUs that provide codification improvements and certain transition elections, including ASU 2018-11, which permits an additional transition method whereby an entity may elect to record a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company was required to and did adopt the standard effective January 1, 2019, using the modified retrospective transition method permitted by ASU 2018-11. Thus, the Company’s reporting for the comparative period presented in the financial statements and disclosures continues to be in accordance with GAAP Topic 840. Upon adoption, the Company recorded a gross-up of assets and liabilities in its Consolidated Balance Sheet, with approximately $116 million for right of use assets and $131 million of lease payment obligations offset by the elimination of $15 million of existing lease incentive and other deferred rent liabilities. Accounting for leases in accordance with Topic 842 has not had a material impact upon the Company’s consolidated results of operations, and is not expected to in future periods. Refer to Note 5 – Operating Leases for further information related to operating lease accounting policy, practical expedient elections for adoption and operating leasing information at adoption and as of September 30, 2019.

Issued but Not Yet Adopted Accounting Standards

In April 2019, the FASB issued ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments.” The Update provides clarification and correction to certain areas of previously issued ASUs concerning financial instruments (2016-01, 2016-13 and 2017-12). The FASB does not expect the provisions contained in this Update to have a significant effect on current accounting practice. Effective dates for adoption of this Update’s provisions vary in accordance with the effective dates and adoption status of the amended ASUs. The Company is currently assessing the impact of adoption of this guidance, but it is not expected to have a material impact upon its financial position and results of operations.

In August 2018, the FASB issued ASU 2018-14, “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” The amendments in this Update modify certain disclosure requirements by removing disclosures that are no longer considered cost beneficial, clarifying specific requirements of disclosures, and adding disclosure requirements identified as relevant. The amendments in this Update are effective for fiscal years ending after December 15, 2020 for public business entities, and early adoption is permitted. The Company is currently assessing the impact of adoption of this guidance upon its pension and postretirement plan disclosures. Adoption of this guidance will have no impact upon the Company’s results of operations or financial condition.

In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” The amendments in this Update modify certain disclosure requirements on fair value measurements set forth in Topic 820, Fair Value Measurements. In addition, the amendments in this Update eliminate the phrase “an entity shall disclose at a minimum” to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements. The amendments in this Update are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 31, 2019, and early adoption is permitted. The Company is currently assessing the impact of adoption of this guidance upon its fair value measurements disclosures. Adoption of this guidance will have no impact upon the Company’s results of operations or financial condition.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The ASU, more commonly referred to as Current Expected Credit Losses, or CECL, requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations are required to use forward-looking information to inform their credit loss estimates. Many of the loss estimation techniques currently applied will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. In addition, the ASU amends the accounting for credit losses on debt securities and purchased financial assets with credit deterioration. The ASU is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with a cumulative-effect adjustment to retained earnings for non-purchased credit impaired loans as of the beginning of the year of adoption. For purchased credit impaired loans, there is no impact to retained earnings upon adoption; rather, the entity will reclassify a portion of the purchase accounting fair value mark to

allowance for credit losses as of the beginning of the year of adoption. Early application is permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company will not early adopt this guidance.

The Company has internally developed credit models and completed the implementation of a vendor provided platform to aggregate inputs and perform the calculation of allowance for credit losses. The validation of the credit loss models is ongoing and expected to be completed during the fourth quarter of 2019. Additional CECL implementation activities in the fourth quarter 2019 will include refinement of procedures, completion of the design and implementation of internal controls over financial reporting, conclusion of validation of credit models and end-to-end processes, and drafting of newly required disclosures.

The Company has completed parallel testing of the CECL estimation process for the third quarter 2019, which included executed controls established to-date surrounding data, models and governance. Results from this process indicated a net increase of approximately 20 to 30 percent over the September 30, 2019 incurred loan loss reserve level utilizing the CECL models and current economic forecast; this range excludes the impact of the loans and debt securities recently acquired from MidSouth. The Company’s CECL allowance for loan losses estimates losses over a two-year reasonable and supportable forecast period utilizing the weighted average of a range of macroeconomic scenarios, and then reverts to longer historical loss experience to estimate losses for the remaining life. Significant drivers in the aforementioned increase were higher calculated reserve levels for longer life real-estate secured loans and the expected funding of off-balance sheet exposures, partially offset by lower reserves for shorter-term commercial loans. Immaterial expected credit losses were calculated on held to maturity debt securities. The amount of increase in allowance for credit losses upon adoption will be impacted by the portfolio composition and quality as well as current economic conditions and forecasts at that time.